1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
|
================
Cython Changelog
================
0.29.30 (2022-05-16)
====================
Bugs fixed
----------
* The GIL handling changes in 0.29.29 introduced a regression where
objects could be deallocated without holding the GIL.
(Github issue #4796)
0.29.29 (2022-05-16)
====================
Features added
--------------
* Avoid acquiring the GIL at the end of nogil functions.
This change was backported in order to avoid generating wrong C code
that would trigger C compiler warnings with tracing support enabled.
Backport by Oleksandr Pavlyk. (Github issue #4637)
Bugs fixed
----------
* Function definitions in ``finally:`` clauses were not correctly generated.
Patch by David Woods. (Github issue #4651)
* A case where C-API functions could be called with a live exception set was fixed.
Patch by Jakub Kulík. (Github issue #4722)
* Pickles can now be exchanged again with those generated from Cython 3.0 modules.
(Github issue #4680)
* Cython now correctly generates Python methods for both the provided regular and
reversed special numeric methods of extension types.
Patch by David Woods. (Github issue #4750)
* Calling unbound extension type methods without arguments could raise an
``IndexError`` instead of a ``TypeError``.
Patch by David Woods. (Github issue #4779)
* Calling unbound ``.__contains__()`` super class methods on some builtin base
types could trigger an infinite recursion.
Patch by David Woods. (Github issue #4785)
* The C union type in pure Python mode mishandled some field names.
Patch by Jordan Brière. (Github issue #4727)
* Allow users to overwrite the C macro ``_USE_MATH_DEFINES``.
Patch by Yuriy Chernyshov. (Github issue #4690)
* Improved compatibility with CPython 3.10/11.
Patches by Thomas Caswell, David Woods. (Github issues #4609, #4667, #4721, #4730, #4777)
* Docstrings of descriptors are now provided in PyPy 7.3.9.
Patch by Matti Picus. (Github issue #4701)
0.29.28 (2022-02-17)
====================
Bugs fixed
----------
* Due to backwards incompatible changes in CPython 3.11a4, the feature flags
``CYTHON_FAST_THREAD_STATE`` and ``CYTHON_USE_EXC_INFO_STACK`` are now disabled
in Python 3.11 and later. They are enabled again in Cython 3.0.
Patch by David Woods. (Github issue #4610)
* A C compiler warning in older PyPy versions was resolved.
Patch by Matti Picus. (Github issue #4236)
0.29.27 (2022-01-28)
====================
Features added
--------------
* The ``cythonize`` command has a new option ``-M`` to generate ``.dep`` dependency
files for the compilation unit. This can be used by external build tools to track
these dependencies.
Patch by Evgeni Burovski. (Github issue #1214)
Bugs fixed
----------
* Compilation failures on PyPy were resolved.
Patches by Matti Picus. (Github issues #4509, #4517)
* Calls to ``range()`` with more than three arguments did not fail.
Original patch by Max Bachmann. (Github issue #4550)
* Some C compiler warnings about missing type struct initialisers in Py3.10 were resolved.
* Cython no longer warns about using OpenMP 3.0 features since they are now
considered generally available.
0.29.26 (2021-12-16)
====================
Bugs fixed
----------
* An incompatibility with CPython 3.11.0a3 was resolved.
(Github issue #4499)
* The ``in`` operator failed on literal lists with starred expressions.
Patch by Arvind Natarajan. (Github issue #3938)
* A C compiler warning in PyPy about a missing struct field initialisation was resolved.
0.29.25 (2021-12-06)
====================
Bugs fixed
----------
* Several incompatibilities with CPython 3.11 were resolved.
Patches by David Woods, Victor Stinner, Thomas Caswell.
(Github issues #4411, #4414, #4415, #4416, #4420, #4428, #4473, #4479, #4480)
* Some C compiler warnings were resolved.
Patches by Lisandro Dalcin and others. (Github issue #4439)
* C++ ``std::move()`` should only be used automatically in MSVC versions that support it.
Patch by Max Bachmann. (Github issue #4191)
* The ``Py_hash_t`` type failed to accept arbitrary "index" values.
(Github issue #2752)
* Avoid copying unaligned 16-bit values since some platforms require them to be aligned.
Use memcpy() instead to let the C compiler decide how to do it.
(Github issue #4343)
* Cython crashed on invalid truthiness tests on C++ types without ``operator bool``.
Patch by David Woods. (Github issue #4348)
* The declaration of ``PyUnicode_CompareWithASCIIString()`` in ``cpython.unicode`` was incorrect.
Patch by Max Bachmann. (Github issue #4344)
0.29.24 (2021-07-14)
====================
Bugs fixed
----------
* Inline functions in pxd files that used memory views could lead to invalid
C code if the module that imported from them does not use memory views.
Patch by David Woods. (Github issue #1415)
* Several declarations in ``libcpp.string`` were added and corrected.
Patch by Janek Bevendorff. (Github issue #4268)
* Pickling unbound Cython compiled methods failed.
Patch by Pierre Glaser. (Github issue #2972)
* The tracing code was adapted to work with CPython 3.10.
* The optimised ``in`` operator failed on unicode strings in Py3.9 and later
that were constructed from an external ``wchar_t`` source.
Also, related C compiler warnings about deprecated C-API usage were resolved.
(Github issue #3925)
* Some compiler crashes were resolved.
Patch by David Woods. (Github issues #4214, #2811)
* An incorrect warning about 'unused' generator expressions was removed.
(GIthub issue #1699)
* The attributes ``gen.gi_frame`` and ``coro.cr_frame`` of Cython compiled
generators and coroutines now return an actual frame object for introspection,
instead of ``None``.
(Github issue #2306)
0.29.23 (2021-04-14)
====================
Bugs fixed
----------
* Some problems with Python 3.10 were resolved.
Patches by Victor Stinner and David Woods. (Github issues #4046, #4100)
* An incorrect "optimisation" was removed that allowed changes to a keyword
dict to leak into keyword arguments passed into a function.
Patch by Peng Weikang. (Github issue #3227)
* Multiplied str constants could end up as bytes constants with language_level=2.
Patch by Alphadelta14 and David Woods. (Github issue #3951)
* ``PY_SSIZE_T_CLEAN`` does not get defined any more if it is already defined.
Patch by Andrew Jones. (Github issue #4104)
0.29.22 (2021-02-20)
====================
Features added
--------------
* Some declarations were added to the provided pxd includes.
Patches by Zackery Spytz and John Kirkham.
(Github issues #3811, #3882, #3899, #3901)
Bugs fixed
----------
* A crash when calling certain functions in Py3.9 and later was resolved.
(Github issue #3917)
* ``const`` memory views of structs failed to compile.
(Github issue #2251)
* ``const`` template declarations could not be nested.
Patch by Ashwin Srinath. (Github issue #1355)
* The declarations in the ``cpython.pycapsule`` module were missing their
``const`` modifiers and generated incorrect C code.
Patch by Warren Weckesser. (Github issue #3964)
* Casts to memory views failed for fused dtypes.
Patch by David Woods. (Github issue #3881)
* ``repr()`` was assumed to return ``str`` instead of ``unicode`` with ``language_level=3``.
(Github issue #3736)
* Calling ``cpdef`` functions from cimported modules crashed the compiler.
Patch by David Woods. (Github issue #4000)
* Cython no longer validates the ABI size of the NumPy classes it compiled against.
See the discussion in https://github.com/numpy/numpy/pull/432
* A C compiler warning about enum value casting was resolved in GCC.
(Github issue #2749)
* Coverage reporting in the annotated HTML file failed in Py3.9.
Patch by Nick Pope. (Github issue #3865)
* The embedding code now reports Python errors as exit status.
* Long type declarations could lead to (harmless) random changes in the
C file when used in auto-generated Python wrappers or pickled classes.
Other changes
-------------
* Variables defined as ``cpdef`` now generate a warning since this
is currently useless and thus does not do what users would expect.
Patch by David Woods. (Github issue #3959)
0.29.21 (2020-07-09)
====================
Bugs fixed
----------
* Fix a regression in 0.29.20 where ``__div__`` failed to be found in extension types.
(Github issue #3688)
* Fix a regression in 0.29.20 where a call inside of a finally clause could fail to compile.
Patch by David Woods. (Github issue #3712)
* Zero-sized buffers could fail to validate as C/Fortran-contiguous.
Patch by Clemens Hofreither. (Github issue #2093)
* ``exec()`` did not allow recent Python syntax features in Py3.8+ due to
https://bugs.python.org/issue35975.
(Github issue #3695)
* Binding staticmethods of Cython functions were not behaving like Python methods in Py3.
Patch by Jeroen Demeyer and Michał Górny. (Github issue #3106)
* Pythran calls to NumPy methods no longer generate useless method lookup code.
* The ``PyUnicode_GET_LENGTH()`` macro was missing from the ``cpython.*`` declarations.
Patch by Thomas Caswell. (Github issue #3692)
* The deprecated ``PyUnicode_*()`` C-API functions are no longer used, except for Unicode
strings that contain lone surrogates. Unicode strings that contain non-BMP characters
or surrogate pairs now generate different C code on 16-bit Python 2.x Unicode deployments
(such as MS-Windows). Generating the C code on Python 3.x is recommended in this case.
Original patches by Inada Naoki and Victor Stinner. (Github issues #3677, #3721, #3697)
* Some template parameters were missing from the C++ ``std::unordered_map`` declaration.
Patch by will. (Github issue #3685)
* Several internal code generation issues regarding temporary variables were resolved.
(Github issue #3708)
0.29.20 (2020-06-10)
====================
Bugs fixed
----------
* Nested try-except statements with multiple ``return`` statements could crash
due to incorrect deletion of the ``except as`` target variable.
(Github issue #3666)
* The ``@classmethod`` decorator no longer rejects unknown input from other decorators.
Patch by David Woods. (Github issue #3660)
* Fused types could leak into unrelated usages.
Patch by David Woods. (Github issue #3642)
* Now uses ``Py_SET_SIZE()`` and ``Py_SET_REFCNT()`` in Py3.9+ to avoid low-level
write access to these object fields.
Patch by Victor Stinner. (Github issue #3639)
* The built-in ``abs()`` function could lead to undefined behaviour when used on
the negative-most value of a signed C integer type.
Patch by Serge Guelton. (Github issue #1911)
* Usages of ``sizeof()`` and ``typeid()`` on uninitialised variables no longer
produce a warning.
Patch by Celelibi. (Github issue #3575)
* The C++ ``typeid()`` function was allowed in C mode.
Patch by Celelibi. (Github issue #3637)
* The error position reported for errors found in f-strings was misleading.
(Github issue #3674)
* The new ``c_api_binop_methods`` directive was added for forward compatibility, but can
only be set to True (the current default value). It can be disabled in Cython 3.0.
0.29.19 (2020-05-20)
====================
Bugs fixed
----------
* A typo in Windows specific code in 0.29.18 was fixed that broke "libc.math".
(Github issue #3622)
* A platform specific test failure in 0.29.18 was fixed.
Patch by smutch. (Github issue #3620)
0.29.18 (2020-05-18)
====================
Bugs fixed
----------
* Exception position reporting could run into race conditions on threaded code.
It now uses function-local variables again.
* Error handling early in the module init code could lead to a crash.
* Error handling in ``cython.array`` creation was improved to avoid calling
C-API functions with an error held.
* A memory corruption was fixed when garbage collection was triggered during calls
to ``PyType_Ready()`` of extension type subclasses.
(Github issue #3603)
* Memory view slicing generated unused error handling code which could negatively
impact the C compiler optimisations for parallel OpenMP code etc. Also, it is
now helped by static branch hints.
(Github issue #2987)
* Cython's built-in OpenMP functions were not translated inside of call arguments.
Original patch by Celelibi and David Woods. (Github issue #3594)
* Complex buffer item types of structs of arrays could fail to validate.
Patch by Leo and smutch. (Github issue #1407)
* Decorators were not allowed on nested `async def` functions.
(Github issue #1462)
* C-tuples could use invalid C struct casting.
Patch by MegaIng. (Github issue #3038)
* Optimised ``%d`` string formatting into f-strings failed on float values.
(Github issue #3092)
* Optimised aligned string formatting (``%05s``, ``%-5s``) failed.
(Github issue #3476)
* When importing the old Cython ``build_ext`` integration with distutils, the
additional command line arguments leaked into the regular command.
Patch by Kamekameha. (Github issue #2209)
* When using the ``CYTHON_NO_PYINIT_EXPORT`` option in C++, the module init function
was not declared as ``extern "C"``.
(Github issue #3414)
* Three missing timedelta access macros were added in ``cpython.datetime``.
* The signature of the NumPy C-API function ``PyArray_SearchSorted()`` was fixed.
Patch by Brock Mendel. (Github issue #3606)
0.29.17 (2020-04-26)
====================
Features added
--------------
* ``std::move()`` is now available from ``libcpp.utility``.
Patch by Omer Ozarslan. (Github issue #2169)
* The ``@cython.binding`` decorator is available in Python code.
(Github issue #3505)
Bugs fixed
----------
* Creating an empty unicode slice with large bounds could crash.
Patch by Sam Sneddon. (Github issue #3531)
* Decoding an empty bytes/char* slice with large bounds could crash.
Patch by Sam Sneddon. (Github issue #3534)
* Re-importing a Cython extension no longer raises the error
"``__reduce_cython__ not found``".
(Github issue #3545)
* Unused C-tuples could generate incorrect code in 0.29.16.
Patch by Kirk Meyer. (Github issue #3543)
* Creating a fused function attached it to the garbage collector before it
was fully initialised, thus risking crashes in rare failure cases.
Original patch by achernomorov. (Github issue #3215)
* Temporary buffer indexing variables were not released and could show up in
C compiler warnings, e.g. in generators.
Patch by David Woods. (Github issues #3430, #3522)
* The compilation cache in ``cython.inline("…")`` failed to take the language
level into account.
Patch by will-ca. (Github issue #3419)
* The deprecated ``PyUnicode_GET_SIZE()`` function is no longer used in Py3.
0.29.16 (2020-03-24)
====================
Bugs fixed
----------
* Temporary internal variables in nested prange loops could leak into other
threads. Patch by Frank Schlimbach. (Github issue #3348)
* Default arguments on fused functions could crash.
Patch by David Woods. (Github issue #3370)
* C-tuples declared in ``.pxd`` files could generate incomplete C code.
Patch by Kirk Meyer. (Github issue #1427)
* Fused functions were not always detected and optimised as Cython
implemented functions.
Patch by David Woods. (Github issue #3384)
* Valid Python object concatenation of (iterable) strings to non-strings
could fail with an exception.
Patch by David Woods. (Github issue #3433)
* Using C functions as temporary values lead to invalid C code.
Original patch by David Woods. (Github issue #3418)
* Fix an unhandled C++ exception in comparisons.
Patch by David Woods. (Github issue #3361)
* Fix deprecated import of "imp" module.
Patch by Matti Picus. (Github issue #3350)
* Fix compatibility with Pythran 0.9.6 and later.
Patch by Serge Guelton. (Github issue #3308)
* The ``_Py_PyAtExit()`` function in ``cpython.pylifecycle`` was misdeclared.
Patch by Zackery Spytz. (Github issue #3382)
* Several missing declarations in ``cpython.*`` were added.
Patches by Zackery Spytz. (Github issue #3452, #3421, #3411, #3402)
* A declaration for ``libc.math.fpclassify()`` was added.
Patch by Zackery Spytz. (Github issue #2514)
* Avoid "undeclared" warning about automatically generated pickle methods.
Patch by David Woods. (Github issue #3353)
* Avoid C compiler warning about unreachable code in ``prange()``.
* Some C compiler warnings in PyPy were resolved.
Patch by Matti Picus. (Github issue #3437)
0.29.15 (2020-02-06)
====================
Bugs fixed
----------
* Crash when returning a temporary Python object from an async-def function.
(Github issue #3337)
* Crash when using ``**kwargs`` in generators.
Patch by David Woods. (Github issue #3265)
* Double reference free in ``__class__`` cell handling for ``super()`` calls.
(Github issue #3246)
* Compile error when using ``*args`` as Python class bases.
(Github issue #3338)
* Import failure in IPython 7.11.
(Github issue #3297)
* Fixed C name collision in the auto-pickle code.
Patch by ThePrez. (Github issue #3238)
* Deprecated import failed in Python 3.9.
(Github issue #3266)
0.29.14 (2019-11-01)
====================
Bugs fixed
----------
* The generated code failed to initialise the ``tp_print`` slot in CPython 3.8.
Patches by Pablo Galindo and Orivej Desh. (Github issues #3171, #3201)
* ``?`` for ``bool`` was missing from the supported NumPy dtypes.
Patch by Max Klein. (Github issue #2675)
* ``await`` was not allowed inside of f-strings.
Patch by Dmitro Getz. (Github issue #2877)
* Coverage analysis failed for projects where the code resides in separate
source sub-directories.
Patch by Antonio Valentino. (Github issue #1985)
* An incorrect compiler warning was fixed in automatic C++ string conversions.
Patch by Gerion Entrup. (Github issue #3108)
* Error reports in the Jupyter notebook showed unhelpful stack traces.
Patch by Matthew Edwards (Github issue #3196).
* ``Python.h`` is now also included explicitly from ``public`` header files.
(Github issue #3133).
* Distutils builds with ``--parallel`` did not work when using Cython's
deprecated ``build_ext`` command.
Patch by Alphadelta14 (Github issue #3187).
Other changes
-------------
* The ``PyMemoryView_*()`` C-API is available in ``cpython.memoryview``.
Patch by Nathan Manville. (Github issue #2541)
0.29.13 (2019-07-26)
====================
Bugs fixed
----------
* A reference leak for ``None`` was fixed when converting a memoryview
to a Python object. (Github issue #3023)
* The declaration of ``PyGILState_STATE`` in ``cpython.pystate`` was unusable.
Patch by Kirill Smelkov. (Github issue #2997)
Other changes
-------------
* The declarations in ``posix.mman`` were extended.
Patches by Kirill Smelkov. (Github issues #2893, #2894, #3012)
0.29.12 (2019-07-07)
====================
Bugs fixed
----------
* Fix compile error in CPython 3.8b2 regarding the ``PyCode_New()`` signature.
(Github issue #3031)
* Fix a C compiler warning about a missing ``int`` downcast.
(Github issue #3028)
* Fix reported error positions of undefined builtins and constants.
Patch by Orivej Desh. (Github issue #3030)
* A 32 bit issue in the Pythran support was resolved.
Patch by Serge Guelton. (Github issue #3032)
0.29.11 (2019-06-30)
====================
Bugs fixed
----------
* Fix compile error in CPython 3.8b2 regarding the ``PyCode_New()`` signature.
Patch by Nick Coghlan. (Github issue #3009)
* Invalid C code generated for lambda functions in cdef methods.
Patch by Josh Tobin. (Github issue #2967)
* Support slice handling in newer Pythran versions.
Patch by Serge Guelton. (Github issue #2989)
* A reference leak in power-of-2 calculation was fixed.
Patch by Sebastian Berg. (Github issue #3022)
* The search order for include files was changed. Previously it was
``include_directories``, ``Cython/Includes``, ``sys.path``. Now it is
``include_directories``, ``sys.path``, ``Cython/Includes``. This was done to
allow third-party ``*.pxd`` files to override the ones in Cython.
Original patch by Matti Picus. (Github issue #2905)
* Setting ``language_level=2`` in a file did not work if ``language_level=3``
was enabled globally before.
Patch by Jeroen Demeyer. (Github issue #2791)
0.29.10 (2019-06-02)
====================
Bugs fixed
----------
* Fix compile errors in CPython 3.8b1 due to the new "tp_vectorcall" slots.
(Github issue #2976)
0.29.9 (2019-05-29)
===================
Bugs fixed
----------
* Fix a crash regression in 0.29.8 when creating code objects fails.
* Remove an incorrect cast when using true-division in C++ operations.
(Github issue #1950)
0.29.8 (2019-05-28)
===================
Bugs fixed
----------
* C compile errors with CPython 3.8 were resolved.
Patch by Marcel Plch. (Github issue #2938)
* Python tuple constants that compare equal but have different item
types could incorrectly be merged into a single constant.
(Github issue #2919)
* Non-ASCII characters in unprefixed strings could crash the compiler when
used with language level ``3str``.
* Starred expressions in %-formatting tuples could fail to compile for
unicode strings. (Github issue #2939)
* Passing Python class references through ``cython.inline()`` was broken.
(Github issue #2936)
0.29.7 (2019-04-14)
===================
Bugs fixed
----------
* Crash when the shared Cython config module gets unloaded and another Cython
module reports an exceptions. Cython now makes sure it keeps an owned reference
to the module.
(Github issue #2885)
* Resolved a C89 compilation problem when enabling the fast-gil sharing feature.
* Coverage reporting did not include the signature line of ``cdef`` functions.
(Github issue #1461)
* Casting a GIL-requiring function into a nogil function now issues a warning.
(Github issue #2879)
* Generators and coroutines were missing their return type annotation.
(Github issue #2884)
0.29.6 (2019-02-27)
===================
Bugs fixed
----------
* Fix a crash when accessing the ``__kwdefaults__`` special attribute of
fused functions. (Github issue #1470)
* Fix the parsing of buffer format strings that contain numeric sizes, which
could lead to incorrect input rejections. (Github issue #2845)
* Avoid a C #pragma in old gcc versions that was only added in GCC 4.6.
Patch by Michael Anselmi. (Github issue #2838)
* Auto-encoding of Unicode strings to UTF-8 C/C++ strings failed in Python 3,
even though the default encoding there is UTF-8.
(Github issue #2819)
0.29.5 (2019-02-09)
===================
Bugs fixed
----------
* Crash when defining a Python subclass of an extension type and repeatedly calling
a cpdef method on it. (Github issue #2823)
* Compiler crash when ``prange()`` loops appear inside of with-statements.
(Github issue #2780)
* Some C compiler warnings were resolved.
Patches by Christoph Gohlke. (Github issues #2815, #2816, #2817, #2822)
* Python conversion of C++ enums failed in 0.29.
Patch by Orivej Desh. (Github issue #2767)
0.29.4 (2019-02-01)
===================
Bugs fixed
----------
* Division of numeric constants by a runtime value of 0 could fail to raise a
``ZeroDivisionError``. (Github issue #2820)
0.29.3 (2019-01-19)
===================
Bugs fixed
----------
* Some C code for memoryviews was generated in a non-deterministic order.
Patch by Martijn van Steenbergen. (Github issue #2779)
* C89 compatibility was accidentally lost since 0.28.
Patches by gastineau and true-pasky. (Github issues #2778, #2801)
* A C compiler cast warning was resolved.
Patch by Michael Buesch. (Github issue #2774)
* An compilation failure with complex numbers under MSVC++ was resolved.
(Github issue #2797)
* Coverage reporting could fail when modules were moved around after the build.
Patch by Wenjun Si. (Github issue #2776)
0.29.2 (2018-12-14)
===================
Bugs fixed
----------
* The code generated for deduplicated constants leaked some references.
(Github issue #2750)
* The declaration of ``sigismember()`` in ``libc.signal`` was corrected.
(Github issue #2756)
* Crashes in compiler and test runner were fixed.
(Github issue #2736, #2755)
* A C compiler warning about an invalid safety check was resolved.
(Github issue #2731)
0.29.1 (2018-11-24)
===================
Bugs fixed
----------
* Extensions compiled with MinGW-64 under Windows could misinterpret integer
objects larger than 15 bit and return incorrect results.
(Github issue #2670)
* Cython no longer requires the source to be writable when copying its data
into a memory view slice.
Patch by Andrey Paramonov. (Github issue #2644)
* Line tracing of ``try``-statements generated invalid C code.
(Github issue #2274)
* When using the ``warn.undeclared`` directive, Cython's own code generated
warnings that are now fixed.
Patch by Nicolas Pauss. (Github issue #2685)
* Cython's memoryviews no longer require strides for setting the shape field
but only the ``PyBUF_ND`` flag to be set.
Patch by John Kirkham. (Github issue #2716)
* Some C compiler warnings about unused memoryview code were fixed.
Patch by Ho Cheuk Ting. (Github issue #2588)
* A C compiler warning about implicit signed/unsigned conversion was fixed.
(Github issue #2729)
* Assignments to C++ references returned by ``operator[]`` could fail to compile.
(Github issue #2671)
* The power operator and the support for NumPy math functions were fixed
in Pythran expressions.
Patch by Serge Guelton. (Github issues #2702, #2709)
* Signatures with memory view arguments now show the expected type
when embedded in docstrings.
Patch by Matthew Chan and Benjamin Weigel. (Github issue #2634)
* Some ``from ... cimport ...`` constructs were not correctly considered
when searching modified dependencies in ``cythonize()`` to decide
whether to recompile a module.
Patch by Kryštof Pilnáček. (Github issue #2638)
* A struct field type in the ``cpython.array`` declarations was corrected.
Patch by John Kirkham. (Github issue #2712)
0.29 (2018-10-14)
=================
Features added
--------------
* PEP-489 multi-phase module initialisation has been enabled again. Module
reloads in other subinterpreters raise an exception to prevent corruption
of the static module state.
* A set of ``mypy`` compatible PEP-484 declarations were added for Cython's C data
types to integrate with static analysers in typed Python code. They are available
in the ``Cython/Shadow.pyi`` module and describe the types in the special ``cython``
module that can be used for typing in Python code.
Original patch by Julian Gethmann. (Github issue #1965)
* Memoryviews are supported in PEP-484/526 style type declarations.
(Github issue #2529)
* ``@cython.nogil`` is supported as a C-function decorator in Python code.
(Github issue #2557)
* Raising exceptions from nogil code will automatically acquire the GIL, instead
of requiring an explicit ``with gil`` block.
* C++ functions can now be declared as potentially raising both C++ and Python
exceptions, so that Cython can handle both correctly.
(Github issue #2615)
* ``cython.inline()`` supports a direct ``language_level`` keyword argument that
was previously only available via a directive.
* A new language level name ``3str`` was added that mostly corresponds to language
level 3, but keeps unprefixed string literals as type 'str' in both Py2 and Py3,
and the builtin 'str' type unchanged. This will become the default in the next
Cython release and is meant to help user code a) transition more easily to this
new default and b) migrate to Python 3 source code semantics without making support
for Python 2.x difficult.
* In CPython 3.6 and later, looking up globals in the module dict is almost
as fast as looking up C globals.
(Github issue #2313)
* For a Python subclass of an extension type, repeated method calls to non-overridden
cpdef methods can avoid the attribute lookup in Py3.6+, which makes them 4x faster.
(Github issue #2313)
* (In-)equality comparisons of objects to integer literals are faster.
(Github issue #2188)
* Some internal and 1-argument method calls are faster.
* Modules that cimport many external extension types from other Cython modules
execute less import requests during module initialisation.
* Constant tuples and slices are deduplicated and only created once per module.
(Github issue #2292)
* The coverage plugin considers more C file extensions such as ``.cc`` and ``.cxx``.
(Github issue #2266)
* The ``cythonize`` command accepts compile time variable values (as set by ``DEF``)
through the new ``-E`` option.
Patch by Jerome Kieffer. (Github issue #2315)
* ``pyximport`` can import from namespace packages.
Patch by Prakhar Goel. (Github issue #2294)
* Some missing numpy and CPython C-API declarations were added.
Patch by John Kirkham. (Github issues #2523, #2520, #2537)
* Declarations for the ``pylifecycle`` C-API functions were added in a new .pxd file
``cpython.pylifecycle``.
* The Pythran support was updated to work with the latest Pythran 0.8.7.
Original patch by Adrien Guinet. (Github issue #2600)
* ``%a`` is included in the string formatting types that are optimised into f-strings.
In this case, it is also automatically mapped to ``%r`` in Python 2.x.
* New C macro ``CYTHON_HEX_VERSION`` to access Cython's version in the same style as
``PY_VERSION_HEX``.
* Constants in ``libc.math`` are now declared as ``const`` to simplify their handling.
* An additional ``check_size`` clause was added to the ``ctypedef class`` name
specification to allow suppressing warnings when importing modules with
backwards-compatible ``PyTypeObject`` size changes.
Patch by Matti Picus. (Github issue #2627)
Bugs fixed
----------
* The exception handling in generators and coroutines under CPython 3.7 was adapted
to the newly introduced exception stack. Users of Cython 0.28 who want to support
Python 3.7 are encouraged to upgrade to 0.29 to avoid potentially incorrect error
reporting and tracebacks. (Github issue #1958)
* Crash when importing a module under Stackless Python that was built for CPython.
Patch by Anselm Kruis. (Github issue #2534)
* 2-value slicing of typed sequences failed if the start or stop index was None.
Patch by Christian Gibson. (Github issue #2508)
* Multiplied string literals lost their factor when they are part of another
constant expression (e.g. 'x' * 10 + 'y' => 'xy').
* String formatting with the '%' operator didn't call the special ``__rmod__()``
method if the right side is a string subclass that implements it.
(Python issue 28598)
* The directive ``language_level=3`` did not apply to the first token in the
source file. (Github issue #2230)
* Overriding cpdef methods did not work in Python subclasses with slots.
Note that this can have a performance impact on calls from Cython code.
(Github issue #1771)
* Fix declarations of builtin or C types using strings in pure python mode.
(Github issue #2046)
* Generator expressions and lambdas failed to compile in ``@cfunc`` functions.
(Github issue #459)
* Global names with ``const`` types were not excluded from star-import assignments
which could lead to invalid C code.
(Github issue #2621)
* Several internal function signatures were fixed that lead to warnings in gcc-8.
(Github issue #2363)
* The numpy helper functions ``set_array_base()`` and ``get_array_base()``
were adapted to the current numpy C-API recommendations.
Patch by Matti Picus. (Github issue #2528)
* Some NumPy related code was updated to avoid deprecated API usage.
Original patch by jbrockmendel. (Github issue #2559)
* Several C++ STL declarations were extended and corrected.
Patch by Valentin Valls. (Github issue #2207)
* C lines of the module init function were unconditionally not reported in
exception stack traces.
Patch by Jeroen Demeyer. (Github issue #2492)
* When PEP-489 support is enabled, reloading the module overwrote any static
module state. It now raises an exception instead, given that reloading is
not actually supported.
* Object-returning, C++ exception throwing functions were not checking that
the return value was non-null.
Original patch by Matt Wozniski (Github Issue #2603)
* The source file encoding detection could get confused if the
``c_string_encoding`` directive appeared within the first two lines.
(Github issue #2632)
* Cython generated modules no longer emit a warning during import when the
size of the NumPy array type is larger than what was found at compile time.
Instead, this is assumed to be a backwards compatible change on NumPy side.
Other changes
-------------
* Cython now emits a warning when no ``language_level`` (2, 3 or '3str') is set
explicitly, neither as a ``cythonize()`` option nor as a compiler directive.
This is meant to prepare the transition of the default language level from
currently Py2 to Py3, since that is what most new users will expect these days.
The future default will, however, not enforce unicode literals, because this
has proven a major obstacle in the support for both Python 2.x and 3.x. The
next major release is intended to make this change, so that it will parse all
code that does not request a specific language level as Python 3 code, but with
``str`` literals. The language level 2 will continue to be supported for an
indefinite time.
* The documentation was restructured, cleaned up and examples are now tested.
The NumPy tutorial was also rewritten to simplify the running example.
Contributed by Gabriel de Marmiesse. (Github issue #2245)
* Cython compiles less of its own modules at build time to reduce the installed
package size to about half of its previous size. This makes the compiler
slightly slower, by about 5-7%.
0.28.6 (2018-11-01)
===================
Bugs fixed
----------
* Extensions compiled with MinGW-64 under Windows could misinterpret integer
objects larger than 15 bit and return incorrect results.
(Github issue #2670)
* Multiplied string literals lost their factor when they are part of another
constant expression (e.g. 'x' * 10 + 'y' => 'xy').
0.28.5 (2018-08-03)
===================
Bugs fixed
----------
* The discouraged usage of GCC's attribute ``optimize("Os")`` was replaced by the
similar attribute ``cold`` to reduce the code impact of the module init functions.
(Github issue #2494)
* A reference leak in Py2.x was fixed when comparing str to unicode for equality.
0.28.4 (2018-07-08)
===================
Bugs fixed
----------
* Reallowing ``tp_clear()`` in a subtype of an ``@no_gc_clear`` extension type
generated an invalid C function call to the (non-existent) base type implementation.
(Github issue #2309)
* Exception catching based on a non-literal (runtime) tuple could fail to match the
exception. (Github issue #2425)
* Compile fix for CPython 3.7.0a2. (Github issue #2477)
0.28.3 (2018-05-27)
===================
Bugs fixed
----------
* Set iteration was broken in non-CPython since 0.28.
* ``UnicodeEncodeError`` in Py2 when ``%s`` formatting is optimised for
unicode strings. (Github issue #2276)
* Work around a crash bug in g++ 4.4.x by disabling the size reduction setting
of the module init function in this version. (Github issue #2235)
* Crash when exceptions occur early during module initialisation.
(Github issue #2199)
0.28.2 (2018-04-13)
===================
Features added
--------------
* ``abs()`` is faster for Python long objects.
* The C++11 methods ``front()`` and ``end()`` were added to the declaration of
``libcpp.string``. Patch by Alex Huszagh. (Github issue #2123)
* The C++11 methods ``reserve()`` and ``bucket_count()`` are declared for
``libcpp.unordered_map``. Patch by Valentin Valls. (Github issue #2168)
Bugs fixed
----------
* The copy of a read-only memoryview was considered read-only as well, whereas
a common reason to copy a read-only view is to make it writable. The result
of the copying is now a writable buffer by default.
(Github issue #2134)
* The ``switch`` statement generation failed to apply recursively to the body of
converted if-statements.
* ``NULL`` was sometimes rejected as exception return value when the returned
type is a fused pointer type.
Patch by Callie LeFave. (Github issue #2177)
* Fixed compatibility with PyPy 5.11.
Patch by Matti Picus. (Github issue #2165)
Other changes
-------------
* The NumPy tutorial was rewritten to use memoryviews instead of the older
buffer declaration syntax.
Contributed by Gabriel de Marmiesse. (Github issue #2162)
0.28.1 (2018-03-18)
===================
Bugs fixed
----------
* ``PyFrozenSet_New()`` was accidentally used in PyPy where it is missing
from the C-API.
* Assignment between some C++ templated types were incorrectly rejected
when the templates mix ``const`` with ``ctypedef``.
(Github issue #2148)
* Undeclared C++ no-args constructors in subclasses could make the compilation
fail if the base class constructor was declared without ``nogil``.
(Github issue #2157)
* Bytes %-formatting inferred ``basestring`` (bytes or unicode) as result type
in some cases where ``bytes`` would have been safe to infer.
(Github issue #2153)
* ``None`` was accidentally disallowed as typed return value of ``dict.pop()``.
(Github issue #2152)
0.28 (2018-03-13)
=================
Features added
--------------
* Cdef classes can now multiply inherit from ordinary Python classes.
(The primary base must still be a c class, possibly ``object``, and
the other bases must *not* be cdef classes.)
* Type inference is now supported for Pythran compiled NumPy expressions.
Patch by Nils Braun. (Github issue #1954)
* The ``const`` modifier can be applied to memoryview declarations to allow
read-only buffers as input. (Github issues #1605, #1869)
* C code in the docstring of a ``cdef extern`` block is copied verbatimly
into the generated file.
Patch by Jeroen Demeyer. (Github issue #1915)
* When compiling with gcc, the module init function is now tuned for small
code size instead of whatever compile flags were provided externally.
Cython now also disables some code intensive optimisations in that function
to further reduce the code size. (Github issue #2102)
* Decorating an async coroutine with ``@cython.iterable_coroutine`` changes its
type at compile time to make it iterable. While this is not strictly in line
with PEP-492, it improves the interoperability with old-style coroutines that
use ``yield from`` instead of ``await``.
* The IPython magic has preliminary support for JupyterLab.
(Github issue #1775)
* The new TSS C-API in CPython 3.7 is supported and has been backported.
Patch by Naotoshi Seo. (Github issue #1932)
* Cython knows the new ``Py_tss_t`` type defined in PEP-539 and automatically
initialises variables declared with that type to ``Py_tss_NEEDS_INIT``,
a value which cannot be used outside of static assignments.
* The set methods ``.remove()`` and ``.discard()`` are optimised.
Patch by Antoine Pitrou. (Github issue #2042)
* ``dict.pop()`` is optimised.
Original patch by Antoine Pitrou. (Github issue #2047)
* Iteration over sets and frozensets is optimised.
(Github issue #2048)
* Safe integer loops (< range(2^30)) are automatically optimised into C loops.
* ``alist.extend([a,b,c])`` is optimised into sequential ``list.append()`` calls
for short literal sequences.
* Calls to builtin methods that are not specifically optimised into C-API calls
now use a cache that avoids repeated lookups of the underlying C function.
(Github issue #2054)
* Single argument function calls can avoid the argument tuple creation in some cases.
* Some redundant extension type checks are avoided.
* Formatting C enum values in f-strings is faster, as well as some other special cases.
* String formatting with the '%' operator is optimised into f-strings in simple cases.
* Subscripting (item access) is faster in some cases.
* Some ``bytearray`` operations have been optimised similar to ``bytes``.
* Some PEP-484/526 container type declarations are now considered for
loop optimisations.
* Indexing into memoryview slices with ``view[i][j]`` is now optimised into
``view[i, j]``.
* Python compatible ``cython.*`` types can now be mixed with type declarations
in Cython syntax.
* Name lookups in the module and in classes are faster.
* Python attribute lookups on extension types without instance dict are faster.
* Some missing signals were added to ``libc/signal.pxd``.
Patch by Jeroen Demeyer. (Github issue #1914)
* The warning about repeated extern declarations is now visible by default.
(Github issue #1874)
* The exception handling of the function types used by CPython's type slot
functions was corrected to match the de-facto standard behaviour, so that
code that uses them directly benefits from automatic and correct exception
propagation. Patch by Jeroen Demeyer. (Github issue #1980)
* Defining the macro ``CYTHON_NO_PYINIT_EXPORT`` will prevent the module init
function from being exported as symbol, e.g. when linking modules statically
in an embedding setup. Patch by AraHaan. (Github issue #1944)
Bugs fixed
----------
* If a module name is explicitly provided for an ``Extension()`` that is compiled
via ``cythonize()``, it was previously ignored and replaced by the source file
name. It can now be used to override the target module name, e.g. for compiling
prefixed accelerator modules from Python files. (Github issue #2038)
* The arguments of the ``num_threads`` parameter of parallel sections
were not sufficiently validated and could lead to invalid C code.
(Github issue #1957)
* Catching exceptions with a non-trivial exception pattern could call into
CPython with a live exception set. This triggered incorrect behaviour
and crashes, especially in CPython 3.7.
* The signature of the special ``__richcmp__()`` method was corrected to recognise
the type of the first argument as ``self``. It was previously treated as plain
object, but CPython actually guarantees that it always has the correct type.
Note: this can change the semantics of user code that previously relied on
``self`` being untyped.
* Some Python 3 exceptions were not recognised as builtins when running Cython
under Python 2.
* Some async helper functions were not defined in the generated C code when
compiling simple async code. (Github issue #2075)
* Line tracing did not include generators and coroutines.
(Github issue #1949)
* C++ declarations for ``unordered_map`` were corrected.
Patch by Michael Schatzow. (Github issue #1484)
* Iterator declarations in C++ ``deque`` and ``vector`` were corrected.
Patch by Alex Huszagh. (Github issue #1870)
* The const modifiers in the C++ ``string`` declarations were corrected, together
with the coercion behaviour of string literals into C++ strings.
(Github issue #2132)
* Some declaration types in ``libc.limits`` were corrected.
Patch by Jeroen Demeyer. (Github issue #2016)
* ``@cython.final`` was not accepted on Python classes with an ``@cython.cclass``
decorator. (Github issue #2040)
* Cython no longer creates useless and incorrect ``PyInstanceMethod`` wrappers for
methods in Python 3. Patch by Jeroen Demeyer. (Github issue #2105)
* The builtin ``bytearray`` type could not be used as base type of cdef classes.
(Github issue #2106)
Other changes
-------------
0.27.3 (2017-11-03)
===================
Bugs fixed
----------
* String forward references to extension types like ``@cython.locals(x="ExtType")``
failed to find the named type. (Github issue #1962)
* NumPy slicing generated incorrect results when compiled with Pythran.
Original patch by Serge Guelton (Github issue #1946).
* Fix "undefined reference" linker error for generators on Windows in Py3.3-3.5.
(Github issue #1968)
* Adapt to recent C-API change of ``PyThreadState`` in CPython 3.7.
* Fix signature of ``PyWeakref_GetObject()`` API declaration.
Patch by Jeroen Demeyer (Github issue #1975).
0.27.2 (2017-10-22)
===================
Bugs fixed
----------
* Comprehensions could incorrectly be optimised away when they appeared in boolean
test contexts. (Github issue #1920)
* The special methods ``__eq__``, ``__lt__`` etc. in extension types did not type
their first argument as the type of the class but ``object``. (Github issue #1935)
* Crash on first lookup of "cline_in_traceback" option during exception handling.
(Github issue #1907)
* Some nested module level comprehensions failed to compile.
(Github issue #1906)
* Compiler crash on some complex type declarations in pure mode.
(Github issue #1908)
* ``std::unordered_map.erase()`` was declared with an incorrect ``void`` return
type in ``libcpp.unordered_map``. (Github issue #1484)
* Invalid use of C++ ``fallthrough`` attribute before C++11 and similar issue in clang.
(Github issue #1930)
* Compiler crash on misnamed properties. (Github issue #1905)
0.27.1 (2017-10-01)
===================
Features added
--------------
* The Jupyter magic has a new debug option ``--verbose`` that shows details about
the distutils invocation. Patch by Boris Filippov (Github issue #1881).
Bugs fixed
----------
* Py3 list comprehensions in class bodies resulted in invalid C code.
(Github issue #1889)
* Modules built for later CPython 3.5.x versions failed to import in 3.5.0/3.5.1.
(Github issue #1880)
* Deallocating fused types functions and methods kept their GC tracking enabled,
which could potentially lead to recursive deallocation attempts.
* Crash when compiling in C++ mode with old setuptools versions.
(Github issue #1879)
* C++ object arguments for the constructor of Cython implemented C++ are now
passed by reference and not by value to allow for non-copyable arguments, such
as ``unique_ptr``.
* API-exported C++ classes with Python object members failed to compile.
(Github issue #1866)
* Some issues with the new relaxed exception value handling were resolved.
* Python classes as annotation types could prevent compilation.
(Github issue #1887)
* Cython annotation types in Python files could lead to import failures
with a "cython undefined" error. Recognised types are now turned into strings.
* Coverage analysis could fail to report on extension modules on some platforms.
* Annotations could be parsed (and rejected) as types even with
``annotation_typing=False``.
Other changes
-------------
* PEP 489 support has been disabled by default to counter incompatibilities with
import setups that try to reload or reinitialise modules.
0.27 (2017-09-23)
=================
Features added
--------------
* Extension module initialisation follows
`PEP 489 <https://www.python.org/dev/peps/pep-0489/>`_ in CPython 3.5+, which
resolves several differences with regard to normal Python modules. This makes
the global names ``__file__`` and ``__path__`` correctly available to module
level code and improves the support for module-level relative imports.
(Github issues #1715, #1753, #1035)
* Asynchronous generators (`PEP 525 <https://www.python.org/dev/peps/pep-0525/>`_)
and asynchronous comprehensions (`PEP 530 <https://www.python.org/dev/peps/pep-0530/>`_)
have been implemented. Note that async generators require finalisation support
in order to allow for asynchronous operations during cleanup, which is only
available in CPython 3.6+. All other functionality has been backported as usual.
* Variable annotations are now parsed according to
`PEP 526 <https://www.python.org/dev/peps/pep-0526/>`_. Cython types (e.g.
``cython.int``) are evaluated as C type declarations and everything else as Python
types. This can be disabled with the directive ``annotation_typing=False``.
Note that most complex PEP-484 style annotations are currently ignored. This will
change in future releases. (Github issue #1850)
* Extension types (also in pure Python mode) can implement the normal special methods
``__eq__``, ``__lt__`` etc. for comparisons instead of the low-level ``__richcmp__``
method. (Github issue #690)
* New decorator ``@cython.exceptval(x=None, check=False)`` that makes the signature
declarations ``except x``, ``except? x`` and ``except *`` available to pure Python
code. Original patch by Antonio Cuni. (Github issue #1653)
* Signature annotations are now included in the signature docstring generated by
the ``embedsignature`` directive. Patch by Lisandro Dalcin (Github issue #1781).
* The gdb support for Python code (``libpython.py``) was updated to the latest
version in CPython 3.7 (git rev 5fe59f8).
* The compiler tries to find a usable exception return value for cdef functions
with ``except *`` if the returned type allows it. Note that this feature is subject
to safety limitations, so it is still better to provide an explicit declaration.
* C functions can be assigned to function pointers with a compatible exception
declaration, not only with exact matches. A side-effect is that certain compatible
signature overrides are now allowed and some more mismatches of exception signatures
are now detected and rejected as errors that were not detected before.
* The IPython/Jupyter magic integration has a new option ``%%cython --pgo`` for profile
guided optimisation. It compiles the cell with PGO settings for the C compiler,
executes it to generate a runtime profile, and then compiles it again using that
profile for C compiler optimisation. Currently only tested with gcc.
* ``len(memoryview)`` can be used in nogil sections to get the size of the
first dimension of a memory view (``shape[0]``). (Github issue #1733)
* C++ classes can now contain (properly refcounted) Python objects.
* NumPy dtype subarrays are now accessible through the C-API.
Patch by Gerald Dalley (Github issue #245).
* Resolves several issues with PyPy and uses faster async slots in PyPy3.
Patch by Ronan Lamy (Github issues #1871, #1878).
Bugs fixed
----------
* Extension types that were cimported from other Cython modules could disagree
about the order of fused cdef methods in their call table. This could lead
to wrong methods being called and potentially also crashes. The fix required
changes to the ordering of fused methods in the call table, which may break
existing compiled modules that call fused cdef methods across module boundaries,
if these methods were implemented in a different order than they were declared
in the corresponding .pxd file. (Github issue #1873)
* The exception state handling in generators and coroutines could lead to
exceptions in the caller being lost if an exception was raised and handled
inside of the coroutine when yielding. (Github issue #1731)
* Loops over ``range(enum)`` were not converted into C for-loops. Note that it
is still recommended to use an explicit cast to a C integer type in this case.
* Error positions of names (e.g. variables) were incorrectly reported after the
name and not at the beginning of the name.
* Compile time ``DEF`` assignments were evaluated even when they occur inside of
falsy ``IF`` blocks. (Github issue #1796)
* Disabling the line tracing from a trace function could fail.
Original patch by Dmitry Trofimov. (Github issue #1769)
* Several issues with the Pythran integration were resolved.
* abs(signed int) now returns a signed rather than unsigned int.
(Github issue #1837)
* Reading ``frame.f_locals`` of a Cython function (e.g. from a debugger or profiler
could modify the module globals. (Github issue #1836)
* Buffer type mismatches in the NumPy buffer support could leak a reference to the
buffer owner.
* Using the "is_f_contig" and "is_c_contig" memoryview methods together could leave
one of them undeclared. (Github issue #1872)
* Compilation failed if the for-in-range loop target was not a variable but a more
complex expression, e.g. an item assignment. (Github issue #1831)
* Compile time evaluations of (partially) constant f-strings could show incorrect
results.
* Escape sequences in raw f-strings (``fr'...'``) were resolved instead of passing
them through as expected.
* Some ref-counting issues in buffer error handling have been resolved.
Other changes
-------------
* Type declarations in signature annotations are now parsed according to
`PEP 484 <https://www.python.org/dev/peps/pep-0484/>`_
typing. Only Cython types (e.g. ``cython.int``) and Python builtin types are
currently considered as type declarations. Everything else is ignored, but this
will change in a future Cython release.
(Github issue #1672)
* The directive ``annotation_typing`` is now ``True`` by default, which enables
parsing type declarations from annotations.
* This release no longer supports Python 3.2.
0.26.1 (2017-08-29)
===================
Features added
--------------
Bugs fixed
----------
* ``cython.view.array`` was missing ``.__len__()``.
* Extension types with a ``.pxd`` override for their ``__releasebuffer__`` slot
(e.g. as provided by Cython for the Python ``array.array`` type) could leak
a reference to the buffer owner on release, thus not freeing the memory.
(Github issue #1638)
* Auto-decoding failed in 0.26 for strings inside of C++ containers.
(Github issue #1790)
* Compile error when inheriting from C++ container types.
(Github issue #1788)
* Invalid C code in generators (declaration after code).
(Github issue #1801)
* Arithmetic operations on ``const`` integer variables could generate invalid code.
(Github issue #1798)
* Local variables with names of special Python methods failed to compile inside of
closures. (Github issue #1797)
* Problem with indirect Emacs buffers in cython-mode.
Patch by Martin Albrecht (Github issue #1743).
* Extension types named ``result`` or ``PickleError`` generated invalid unpickling code.
Patch by Jason Madden (Github issue #1786).
* Bazel integration failed to compile ``.py`` files.
Patch by Guro Bokum (Github issue #1784).
* Some include directories and dependencies were referenced with their absolute paths
in the generated files despite lying within the project directory.
* Failure to compile in Py3.7 due to a modified signature of ``_PyCFunctionFast()``
0.26 (2017-07-19)
=================
Features added
--------------
* Pythran can be used as a backend for evaluating NumPy array expressions.
Patch by Adrien Guinet (Github issue #1607).
* cdef classes now support pickling by default when possible.
This can be disabled with the ``auto_pickle`` directive.
* Speed up comparisons of strings if their hash value is available.
Patch by Claudio Freire (Github issue #1571).
* Support pyximport from zip files.
Patch by Sergei Lebedev (Github issue #1485).
* IPython magic now respects the ``__all__`` variable and ignores
names with leading-underscore (like ``import *`` does).
Patch by Syrtis Major (Github issue #1625).
* ``abs()`` is optimised for C complex numbers.
Patch by da-woods (Github issue #1648).
* The display of C lines in Cython tracebacks can now be enabled at runtime
via ``import cython_runtime; cython_runtime.cline_in_traceback=True``.
The default has been changed to False.
* The overhead of calling fused types generic functions was reduced.
* "cdef extern" include files are now also searched relative to the current file.
Patch by Jeroen Demeyer (Github issue #1654).
* Optional optimization for re-aquiring the GIL, controlled by the
`fast_gil` directive.
Bugs fixed
----------
* Item lookup/assignment with a unicode character as index that is typed
(explicitly or implicitly) as ``Py_UCS4`` or ``Py_UNICODE`` used the
integer value instead of the Unicode string value. Code that relied on
the previous behaviour now triggers a warning that can be disabled by
applying an explicit cast. (Github issue #1602)
* f-string processing was adapted to changes in PEP 498 and CPython 3.6.
* Invalid C code when decoding from UTF-16(LE/BE) byte strings.
(Github issue #1696)
* Unicode escapes in 'ur' raw-unicode strings were not resolved in Py2 code.
Original patch by Aaron Gallagher (Github issue #1594).
* File paths of code objects are now relative.
Original patch by Jelmer Vernooij (Github issue #1565).
* Decorators of cdef class methods could be executed twice.
Patch by Jeroen Demeyer (Github issue #1724).
* Dict iteration using the Py2 ``iter*`` methods failed in PyPy3.
Patch by Armin Rigo (Github issue #1631).
* Several warnings in the generated code are now suppressed.
Other changes
-------------
* The ``unraisable_tracebacks`` option now defaults to ``True``.
* Coercion of C++ containers to Python is no longer automatic on attribute
access (Github issue #1521).
* Access to Python attributes of cimported modules without the corresponding
import is now a compile-time (rather than runtime) error.
* Do not use special dll linkage for "cdef public" functions.
Patch by Jeroen Demeyer (Github issue #1687).
* cdef/cpdef methods must match their declarations. See Github Issue #1732.
This is now a warning and will be an error in future releases.
0.25.2 (2016-12-08)
===================
Bugs fixed
----------
* Fixes several issues with C++ template deduction.
* Fixes a issue with bound method type inference (Github issue #551).
* Fixes a bug with cascaded tuple assignment (Github issue #1523).
* Fixed or silenced many Clang warnings.
* Fixes bug with powers of pure real complex numbers (Github issue #1538).
0.25.1 (2016-10-26)
===================
Bugs fixed
----------
* Fixes a bug with ``isinstance(o, Exception)`` (Github issue #1496).
* Fixes bug with ``cython.view.array`` missing utility code in some cases
(Github issue #1502).
Other changes
-------------
* The distutils extension ``Cython.Distutils.build_ext`` has been reverted,
temporarily, to be ``old_build_ext`` to give projects time to migrate.
The new build_ext is available as ``new_build_ext``.
0.25 (2016-10-25)
=================
Features added
--------------
* def/cpdef methods of cdef classes benefit from Cython's internal function
implementation, which enables introspection and line profiling for them.
Implementation sponsored by Turbostream (www.turbostream-cfd.com).
* Calls to Python functions are faster, following the recent "FastCall"
optimisations that Victor Stinner implemented for CPython 3.6.
See https://bugs.python.org/issue27128 and related issues.
* The new METH_FASTCALL calling convention for PyCFunctions is supported
in CPython 3.6. See https://bugs.python.org/issue27810
* Initial support for using Cython modules in Pyston.
Patch by Boxiang Sun.
* Dynamic Python attributes are allowed on cdef classes if an attribute
``cdef dict __dict__`` is declared in the class. Patch by empyrical.
* Cython implemented C++ classes can make direct calls to base class methods.
Patch by empyrical.
* C++ classes can now have typedef members. STL containers updated with
value_type.
* New directive ``cython.no_gc`` to fully disable GC for a cdef class.
Patch by Claudio Freire.
* Buffer variables are no longer excluded from ``locals()``.
Patch by da-woods.
* Building f-strings is faster, especially when formatting C integers.
* for-loop iteration over "std::string".
* ``libc/math.pxd`` provides ``e`` and ``pi`` as alias constants to simplify
usage as a drop-in replacement for Python's math module.
* Speed up cython.inline().
* Binary lshift operations with small constant Python integers are faster.
* Some integer operations on Python long objects are faster in Python 2.7.
* Support for the C++ ``typeid`` operator.
* Support for bazel using a the pyx_library rule in //Tools:rules.bzl.
Significant Bugs fixed
----------------------
* Division of complex numbers avoids overflow by using Smith's method.
* Some function signatures in ``libc.math`` and ``numpy.pxd`` were incorrect.
Patch by Michael Seifert.
Other changes
-------------
* The "%%cython" IPython/jupyter magic now defaults to the language level of
the current jupyter kernel. The language level can be set explicitly with
"%%cython -2" or "%%cython -3".
* The distutils extension ``Cython.Distutils.build_ext`` has now been updated
to use cythonize which properly handles dependencies. The old extension can
still be found in ``Cython.Distutils.old_build_ext`` and is now deprecated.
* ``directive_defaults`` is no longer available in ``Cython.Compiler.Options``,
use ``get_directive_defaults()`` instead.
0.24.1 (2016-07-15)
===================
Bugs fixed
----------
* IPython cell magic was lacking a good way to enable Python 3 code semantics.
It can now be used as "%%cython -3".
* Follow a recent change in `PEP 492 <https://www.python.org/dev/peps/pep-0492/>`_
and CPython 3.5.2 that now requires the ``__aiter__()`` method of asynchronous
iterators to be a simple ``def`` method instead of an ``async def`` method.
* Coroutines and generators were lacking the ``__module__`` special attribute.
* C++ ``std::complex`` values failed to auto-convert from and to Python complex
objects.
* Namespaced C++ types could not be used as memory view types due to lack of
name mangling. Patch by Ivan Smirnov.
* Assignments between identical C++ types that were declared with differently
typedefed template types could fail.
* Rebuilds could fail to evaluate dependency timestamps in C++ mode.
Patch by Ian Henriksen.
* Macros defined in the ``distutils`` compiler option do not require values
anymore. Patch by Ian Henriksen.
* Minor fixes for MSVC, Cygwin and PyPy.
0.24 (2016-04-04)
=================
Features added
--------------
* `PEP 498 <https://www.python.org/dev/peps/pep-0498/>`_:
Literal String Formatting (f-strings).
Original patch by Jelle Zijlstra.
* `PEP 515 <https://www.python.org/dev/peps/pep-0515/>`_:
Underscores as visual separators in number literals.
* Parser was adapted to some minor syntax changes in Py3.6, e.g.
https://bugs.python.org/issue9232
* The embedded C code comments that show the original source code
can be discarded with the new directive ``emit_code_comments=False``.
* Cpdef enums are now first-class iterable, callable types in Python.
* Ctuples can now be declared in pure Python code.
* Posix declarations for DLL loading and stdio extensions were added.
Patch by Lars Buitinck.
* The Py2-only builtins ``unicode()``, ``xrange()``, ``reduce()`` and
``long`` are now also available in compile time ``DEF`` expressions
when compiling with Py3.
* Exception type tests have slightly lower overhead.
This fixes ticket 868.
* @property syntax fully supported in cdef classes, old syntax deprecated.
* C++ classes can now be declared with default template parameters.
Bugs fixed
----------
* C++ exceptions raised by overloaded C++ operators were not always
handled. Patch by Ian Henriksen.
* C string literals were previously always stored as non-const global
variables in the module. They are now stored as global constants
when possible, and otherwise as non-const C string literals in the
generated code that uses them. This improves compatibility with
strict C compiler options and prevents non-const strings literals
with the same content from being incorrectly merged.
* Compile time evaluated ``str`` expressions (``DEF``) now behave in a
more useful way by turning into Unicode strings when compiling under
Python 3. This allows using them as intermediate values in expressions.
Previously, they always evaluated to bytes objects.
* ``isinf()`` declarations in ``libc/math.pxd`` and ``numpy/math.pxd`` now
reflect the actual tristate ``int`` return value instead of using ``bint``.
* Literal assignments to ctuples avoid Python tuple round-trips in some
more corner cases.
* Iteration over ``dict(...).items()`` failed to get optimised when dict
arguments included keyword arguments.
* cProfile now correctly profiles cpdef functions and methods.
0.23.5 (2016-03-26)
===================
* Compile errors and warnings in integer type conversion code. This fixes
ticket 877. Patches by Christian Neukirchen, Nikolaus Rath, Ian Henriksen.
* Reference leak when "*args" argument was reassigned in closures.
* Truth-testing Unicode strings could waste time and memory in Py3.3+.
* Return values of async functions could be ignored and replaced by ``None``.
* Compiler crash in CPython 3.6.
* Fix prange() to behave identically to range(). The end condition was
miscalculated when the range was not exactly divisible by the step.
* Optimised ``all(genexpr)``/``any(genexpr)`` calls could warn about unused
code. This fixes ticket 876.
0.23.4 (2015-10-10)
===================
Bugs fixed
----------
* Memory leak when calling Python functions in PyPy.
* Compilation problem with MSVC in C99-ish mode.
* Warning about unused values in a helper macro.
0.23.3 (2015-09-29)
===================
Bugs fixed
----------
* Invalid C code for some builtin methods. This fixes ticket 856 again.
* Incorrect C code in helper functions for PyLong conversion and string
decoding. This fixes ticket 863, ticket 864 and ticket 865.
Original patch by Nikolaus Rath.
* Large folded or inserted integer constants could use too small C
integer types and thus trigger a value wrap-around.
Other changes
-------------
* The coroutine and generator types of Cython now also register directly
with the ``Coroutine`` and ``Generator`` ABCs in the ``backports_abc``
module if it can be imported. This fixes ticket 870.
0.23.2 (2015-09-11)
===================
Bugs fixed
----------
* Compiler crash when analysing some optimised expressions.
* Coverage plugin was adapted to coverage.py 4.0 beta 2.
* C++ destructor calls could fail when '&' operator is overwritten.
* Incorrect C literal generation for large integers in compile-time
evaluated DEF expressions and constant folded expressions.
* Byte string constants could end up as Unicode strings when originating
from compile-time evaluated DEF expressions.
* Invalid C code when caching known builtin methods.
This fixes ticket 860.
* ``ino_t`` in ``posix.types`` was not declared as ``unsigned``.
* Declarations in ``libcpp/memory.pxd`` were missing ``operator!()``.
Patch by Leo Razoumov.
* Static cdef methods can now be declared in .pxd files.
0.23.1 (2015-08-22)
===================
Bugs fixed
----------
* Invalid C code for generators. This fixes ticket 858.
* Invalid C code for some builtin methods. This fixes ticket 856.
* Invalid C code for unused local buffer variables.
This fixes ticket 154.
* Test failures on 32bit systems. This fixes ticket 857.
* Code that uses ``from xyz import *`` and global C struct/union/array
variables could fail to compile due to missing helper functions.
This fixes ticket 851.
* Misnamed PEP 492 coroutine property ``cr_yieldfrom`` renamed to
``cr_await`` to match CPython.
* Missing deallocation code for C++ object attributes in certain
extension class hierarchies.
* Crash when async coroutine was not awaited.
* Compiler crash on ``yield`` in signature annotations and default
argument values. Both are forbidden now.
* Compiler crash on certain constructs in ``finally`` clauses.
* Cython failed to build when CPython's pgen is installed.
0.23 (2015-08-08)
=================
Features added
--------------
* `PEP 492 <https://www.python.org/dev/peps/pep-0492/>`_
(async/await) was implemented.
* `PEP 448 <https://www.python.org/dev/peps/pep-0448/>`_
(Additional Unpacking Generalizations) was implemented.
* Support for coverage.py 4.0+ can be enabled by adding the plugin
"Cython.Coverage" to the ".coveragerc" config file.
* Annotated HTML source pages can integrate (XML) coverage reports.
* Tracing is supported in ``nogil`` functions/sections and module init code.
* When generators are used in a Cython module and the module imports the
modules "inspect" and/or "asyncio", Cython enables interoperability by
patching these modules during the import to recognise Cython's internal
generator and coroutine types. This can be disabled by C compiling the
module with "-D CYTHON_PATCH_ASYNCIO=0" or "-D CYTHON_PATCH_INSPECT=0"
* When generators or coroutines are used in a Cython module, their types
are registered with the ``Generator`` and ``Coroutine`` ABCs in the
``collections`` or ``collections.abc`` stdlib module at import time to
enable interoperability with code that needs to detect and process Python
generators/coroutines. These ABCs were added in CPython 3.5 and are
available for older Python versions through the ``backports_abc`` module
on PyPI. See https://bugs.python.org/issue24018
* Adding/subtracting/dividing/modulus and equality comparisons with
constant Python floats and small integers are faster.
* Binary and/or/xor/rshift operations with small constant Python integers
are faster.
* When called on generator expressions, the builtins ``all()``, ``any()``,
``dict()``, ``list()``, ``set()``, ``sorted()`` and ``unicode.join()``
avoid the generator iteration overhead by inlining a part of their
functionality into the for-loop.
* Keyword argument dicts are no longer copied on function entry when they
are not being used or only passed through to other function calls (e.g.
in wrapper functions).
* The ``PyTypeObject`` declaration in ``cpython.object`` was extended.
* The builtin ``type`` type is now declared as PyTypeObject in source,
allowing for extern functions taking type parameters to have the correct
C signatures. Note that this might break code that uses ``type`` just
for passing around Python types in typed variables. Removing the type
declaration provides a backwards compatible fix.
* ``wraparound()`` and ``boundscheck()`` are available as no-ops in pure
Python mode.
* Const iterators were added to the provided C++ STL declarations.
* Smart pointers were added to the provided C++ STL declarations.
Patch by Daniel Filonik.
* ``NULL`` is allowed as default argument when embedding signatures.
This fixes ticket 843.
* When compiling with ``--embed``, the internal module name is changed to
``__main__`` to allow arbitrary program names, including those that would
be invalid for modules. Note that this prevents reuse of the generated
C code as an importable module.
* External C++ classes that overload the assignment operator can be used.
Patch by Ian Henriksen.
* Support operator bool() for C++ classes so they can be used in if statements.
Bugs fixed
----------
* Calling "yield from" from Python on a Cython generator that returned a
value triggered a crash in CPython. This is now being worked around.
See https://bugs.python.org/issue23996
* Language level 3 did not enable true division (a.k.a. float division)
for integer operands.
* Functions with fused argument types that included a generic 'object'
fallback could end up using that fallback also for other explicitly
listed object types.
* Relative cimports could accidentally fall back to trying an absolute
cimport on failure.
* The result of calling a C struct constructor no longer requires an
intermediate assignment when coercing to a Python dict.
* C++ exception declarations with mapping functions could fail to compile
when pre-declared in .pxd files.
* ``cpdef void`` methods are now permitted.
* ``abs(cint)`` could fail to compile in MSVC and used sub-optimal code
in C++. Patch by David Vierra, original patch by Michael Enßlin.
* Buffer index calculations using index variables with small C integer
types could overflow for large buffer sizes.
Original patch by David Vierra.
* C unions use a saner way to coerce from and to Python dicts.
* When compiling a module ``foo.pyx``, the directories in ``sys.path``
are no longer searched when looking for ``foo.pxd``.
Patch by Jeroen Demeyer.
* Memory leaks in the embedding main function were fixed.
Original patch by Michael Enßlin.
* Some complex Python expressions could fail to compile inside of finally
clauses.
* Unprefixed 'str' literals were not supported as C varargs arguments.
* Fixed type errors in conversion enum types to/from Python. Note that
this imposes stricter correctness requirements on enum declarations.
Other changes
-------------
* Changed mangling scheme in header files generated by ``cdef api``
declarations.
* Installation under CPython 3.3+ no longer requires a pass of the
2to3 tool. This also makes it possible to run Cython in Python
3.3+ from a source checkout without installing it first.
Patch by Petr Viktorin.
* ``jedi-typer.py`` (in ``Tools/``) was extended and renamed to
``jedityper.py`` (to make it importable) and now works with and
requires Jedi 0.9. Patch by Tzer-jen Wei.
0.22.1 (2015-06-20)
===================
Bugs fixed
----------
* Crash when returning values on generator termination.
* In some cases, exceptions raised during internal isinstance() checks were
not propagated.
* Runtime reported file paths of source files (e.g for profiling and tracing)
are now relative to the build root directory instead of the main source file.
* Tracing exception handling code could enter the trace function with an active
exception set.
* The internal generator function type was not shared across modules.
* Comparisons of (inferred) ctuples failed to compile.
* Closures inside of cdef functions returning ``void`` failed to compile.
* Using ``const`` C++ references in intermediate parts of longer expressions
could fail to compile.
* C++ exception declarations with mapping functions could fail to compile when
pre-declared in .pxd files.
* C++ compilation could fail with an ambiguity error in recent MacOS-X Xcode
versions.
* C compilation could fail in pypy3.
* Fixed a memory leak in the compiler when compiling multiple modules.
* When compiling multiple modules, external library dependencies could leak
into later compiler runs. Fix by Jeroen Demeyer. This fixes ticket 845.
0.22 (2015-02-11)
=================
Features added
--------------
* C functions can coerce to Python functions, which allows passing them
around as callable objects.
* C arrays can be assigned by value and auto-coerce from Python iterables
and to Python lists (and tuples).
* Extern C functions can now be declared as cpdef to export them to
the module's Python namespace. Extern C functions in pxd files export
their values to their own module, iff it exists.
* Anonymous C tuple types can be declared as (ctype1, ctype2, ...).
* `PEP 479 <https://www.python.org/dev/peps/pep-0479/>`_:
turn accidental StopIteration exceptions that exit generators
into a RuntimeError, activated with future import "generator_stop".
* Looping over ``reversed(range())`` is optimised in the same way as
``range()``. Patch by Favian Contreras.
Bugs fixed
----------
* Mismatching 'except' declarations on signatures in .pxd and .pyx files failed
to produce a compile error.
* Failure to find any files for the path pattern(s) passed into ``cythonize()``
is now an error to more easily detect accidental typos.
* The ``logaddexp`` family of functions in ``numpy.math`` now has correct
declarations.
* In Py2.6/7 and Py3.2, simple Cython memory views could accidentally be
interpreted as non-contiguous by CPython, which could trigger a CPython
bug when copying data from them, thus leading to data corruption.
See CPython issues 12834 and 23349.
Other changes
-------------
* Preliminary support for defining the Cython language with a formal grammar.
To try parsing your files against this grammar, use the --formal_grammar directive.
Experimental.
* ``_`` is no longer considered a cacheable builtin as it could interfere with
gettext.
* Cythonize-computed metadata now cached in the generated C files.
* Several corrections and extensions in numpy, cpython, and libcpp pxd files.
0.21.2 (2014-12-27)
===================
Bugs fixed
----------
* Crash when assigning a C value to both a Python and C target at the same time.
* Automatic coercion from C++ strings to ``str`` generated incomplete code that
failed to compile.
* Declaring a constructor in a C++ child class erroneously required a default
constructor declaration in the super class.
* ``resize_smart()`` in ``cpython.array`` was broken.
* Functions in ``libcpp.cast`` are now declared as ``nogil``.
* Some missing C-API declarations were added.
* Py3 main code in embedding program code was lacking casts.
* Exception related to distutils "Distribution" class type in pyximport under
latest CPython 2.7 and 3.4 releases when setuptools is being imported later.
0.21.1 (2014-10-18)
===================
Features added
--------------
* New ``cythonize`` option ``-a`` to generate the annotated HTML source view.
* Missing C-API declarations in ``cpython.unicode`` were added.
* Passing ``language='c++'`` into cythonize() globally enables C++ mode for
all modules that were not passed as Extension objects (i.e. only source
files and file patterns).
* ``Py_hash_t`` is a known type (used in CPython for hash values).
* ``PySlice_*()`` C-API functions are available from the ``cpython.slice``
module.
* Allow arrays of C++ classes.
Bugs fixed
----------
* Reference leak for non-simple Python expressions in boolean and/or expressions.
* To fix a name collision and to reflect availability on host platforms,
standard C declarations [ clock(), time(), struct tm and tm* functions ]
were moved from posix/time.pxd to a new libc/time.pxd. Patch by Charles
Blake.
* Rerunning unmodified modules in IPython's cython support failed.
Patch by Matthias Bussonier.
* Casting C++ ``std::string`` to Python byte strings failed when
auto-decoding was enabled.
* Fatal exceptions in global module init code could lead to crashes
if the already created module was used later on (e.g. through a
stale reference in sys.modules or elsewhere).
* ``cythonize.py`` script was not installed on MS-Windows.
Other changes
-------------
* Compilation no longer fails hard when unknown compilation options are
passed. Instead, it raises a warning and ignores them (as it did silently
before 0.21). This will be changed back to an error in a future release.
0.21 (2014-09-10)
=================
Features added
--------------
* C (cdef) functions allow inner Python functions.
* Enums can now be declared as cpdef to export their values to
the module's Python namespace. Cpdef enums in pxd files export
their values to their own module, iff it exists.
* Allow @staticmethod decorator to declare static cdef methods.
This is especially useful for declaring "constructors" for
cdef classes that can take non-Python arguments.
* Taking a ``char*`` from a temporary Python string object is safer
in more cases and can be done inside of non-trivial expressions,
including arguments of a function call. A compile time error
is raised only when such a pointer is assigned to a variable and
would thus exceed the lifetime of the string itself.
* Generators have new properties ``__name__`` and ``__qualname__``
that provide the plain/qualified name of the generator function
(following CPython 3.5). See http://bugs.python.org/issue21205
* The ``inline`` function modifier is available as a decorator
``@cython.inline`` in pure mode.
* When cygdb is run in a virtualenv, it enables the same virtualenv
inside of the debugger. Patch by Marc Abramowitz.
* PEP 465: dedicated infix operator for matrix multiplication (A @ B).
* HTML output of annotated code uses Pygments for code highlighting
and generally received a major overhaul by Matthias Bussonier.
* IPython magic support is now available directly from Cython with
the command "%load_ext cython". Cython code can directly be
executed in a cell when marked with "%%cython". Code analysis
is available with "%%cython -a". Patch by Martín Gaitán.
* Simple support for declaring Python object types in Python signature
annotations. Currently requires setting the compiler directive
``annotation_typing=True``.
* New directive ``use_switch`` (defaults to True) to optionally disable
the optimization of chained if statement to C switch statements.
* Defines dynamic_cast et al. in ``libcpp.cast`` and C++ heap data
structure operations in ``libcpp.algorithm``.
* Shipped header declarations in ``posix.*`` were extended to cover
more of the POSIX API. Patches by Lars Buitinck and Mark Peek.
Optimizations
-------------
* Simple calls to C implemented Python functions/methods are faster.
This also speeds up many operations on builtins that Cython cannot
otherwise optimise.
* The "and"/"or" operators try to avoid unnecessary coercions of their
arguments. They now evaluate the truth value of each argument
independently and only coerce the final result of the whole expression
to the target type (e.g. the type on the left side of an assignment).
This also avoids reference counting overhead for Python values during
evaluation and generally improves the code flow in the generated C code.
* The Python expression "2 ** N" is optimised into bit shifting.
See http://bugs.python.org/issue21420
* Cascaded assignments (a = b = ...) try to minimise the number of
type coercions.
* Calls to ``slice()`` are translated to a straight C-API call.
Bugs fixed
----------
* Crash when assigning memory views from ternary conditional expressions.
* Nested C++ templates could lead to unseparated ">>" characters being
generated into the C++ declarations, which older C++ compilers could
not parse.
* Sending SIGINT (Ctrl-C) during parallel cythonize() builds could
hang the child processes.
* No longer ignore local setup.cfg files for distutils in pyximport.
Patch by Martin Teichmann.
* Taking a ``char*`` from an indexed Python string generated unsafe
reference counting code.
* Set literals now create all of their items before trying to add them
to the set, following the behaviour in CPython. This makes a
difference in the rare case that the item creation has side effects
and some items are not hashable (or if hashing them has side effects,
too).
* Cython no longer generates the cross product of C functions for code
that uses memory views of fused types in function signatures (e.g.
``cdef func(floating[:] a, floating[:] b)``). This is considered the
expected behaviour by most users and was previously inconsistent with
other structured types like C arrays. Code that really wants all type
combinations can create the same fused memoryview type under different
names and use those in the signature to make it clear which types are
independent.
* Names that were unknown at compile time were looked up as builtins at
runtime but not as global module names. Trying both lookups helps with
globals() manipulation.
* Fixed stl container conversion for typedef element types.
* ``obj.pop(x)`` truncated large C integer values of x to ``Py_ssize_t``.
* ``__init__.pyc`` is recognised as marking a package directory
(in addition to .py, .pyx and .pxd).
* Syntax highlighting in ``cython-mode.el`` for Emacs no longer
incorrectly highlights keywords found as part of longer names.
* Correctly handle ``from cython.submodule cimport name``.
* Fix infinite recursion when using super with cpdef methods.
* No-args ``dir()`` was not guaranteed to return a sorted list.
Other changes
-------------
* The header line in the generated C files no longer contains the
timestamp but only the Cython version that wrote it. This was
changed to make builds more reproducible.
* Removed support for CPython 2.4, 2.5 and 3.1.
* The licensing implications on the generated code were clarified
to avoid legal constraints for users.
0.20.2 (2014-06-16)
===================
Features added
--------------
* Some optimisations for set/frozenset instantiation.
* Support for C++ unordered_set and unordered_map.
Bugs fixed
----------
* Access to attributes of optimised builtin methods (e.g.
``[].append.__name__``) could fail to compile.
* Memory leak when extension subtypes add a memory view as attribute
to those of the parent type without having Python object attributes
or a user provided dealloc method.
* Compiler crash on readonly properties in "binding" mode.
* Auto-encoding with ``c_string_encoding=ascii`` failed in Py3.3.
* Crash when subtyping freelist enabled Cython extension types with
Python classes that use ``__slots__``.
* Freelist usage is restricted to CPython to avoid problems with other
Python implementations.
* Memory leak in memory views when copying overlapping, contiguous slices.
* Format checking when requesting non-contiguous buffers from
``cython.array`` objects was accidentally omitted in Py3.
* C++ destructor calls in extension types could fail to compile in clang.
* Buffer format validation failed for sequences of strings in structs.
* Docstrings on extension type attributes in .pxd files were rejected.
0.20.1 (2014-02-11)
===================
Bugs fixed
----------
* Build error under recent MacOS-X versions where ``isspace()`` could not be
resolved by clang.
* List/Tuple literals multiplied by more than one factor were only multiplied
by the last factor instead of all.
* Lookups of special methods (specifically for context managers) could fail
in Python <= 2.6/3.1.
* Local variables were erroneously appended to the signature introspection
of Cython implemented functions with keyword-only arguments under Python 3.
* In-place assignments to variables with inferred Python builtin/extension
types could fail with type errors if the result value type was incompatible
with the type of the previous value.
* The C code generation order of cdef classes, closures, helper code,
etc. was not deterministic, thus leading to high code churn.
* Type inference could fail to deduce C enum types.
* Type inference could deduce unsafe or inefficient types from integer
assignments within a mix of inferred Python variables and integer
variables.
0.20 (2014-01-18)
=================
Features added
--------------
* Support for CPython 3.4.
* Support for calling C++ template functions.
* ``yield`` is supported in ``finally`` clauses.
* The C code generated for finally blocks is duplicated for each exit
case to allow for better optimisations by the C compiler.
* Cython tries to undo the Python optimisationism of assigning a bound
method to a local variable when it can generate better code for the
direct call.
* Constant Python float values are cached.
* String equality comparisons can use faster type specific code in
more cases than before.
* String/Unicode formatting using the '%' operator uses a faster
C-API call.
* ``bytearray`` has become a known type and supports coercion from and
to C strings. Indexing, slicing and decoding is optimised. Note that
this may have an impact on existing code due to type inference.
* Using ``cdef basestring stringvar`` and function arguments typed as
``basestring`` is now meaningful and allows assigning exactly
``str`` and ``unicode`` objects, but no subtypes of these types.
* Support for the ``__debug__`` builtin.
* Assertions in Cython compiled modules are disabled if the running
Python interpreter was started with the "-O" option.
* Some types that Cython provides internally, such as functions and
generators, are now shared across modules if more than one Cython
implemented module is imported.
* The type inference algorithm works more fine granular by taking the
results of the control flow analysis into account.
* A new script in ``bin/cythonize`` provides a command line frontend
to the cythonize() compilation function (including distutils build).
* The new extension type decorator ``@cython.no_gc_clear`` prevents
objects from being cleared during cyclic garbage collection, thus
making sure that object attributes are kept alive until deallocation.
* During cyclic garbage collection, attributes of extension types that
cannot create reference cycles due to their type (e.g. strings) are
no longer considered for traversal or clearing. This can reduce the
processing overhead when searching for or cleaning up reference cycles.
* Package compilation (i.e. ``__init__.py`` files) now works, starting
with Python 3.3.
* The cython-mode.el script for Emacs was updated. Patch by Ivan Andrus.
* An option common_utility_include_dir was added to cythonize() to save
oft-used utility code once in a separate directory rather than as
part of each generated file.
* ``unraisable_tracebacks`` directive added to control printing of
tracebacks of unraisable exceptions.
Bugs fixed
----------
* Abstract Python classes that subtyped a Cython extension type
failed to raise an exception on instantiation, and thus ended
up being instantiated.
* ``set.add(a_tuple)`` and ``set.discard(a_tuple)`` failed with a
TypeError in Py2.4.
* The PEP 3155 ``__qualname__`` was incorrect for nested classes and
inner classes/functions declared as ``global``.
* Several corner cases in the try-finally statement were fixed.
* The metaclass of a Python class was not inherited from its parent
class(es). It is now extracted from the list of base classes if not
provided explicitly using the Py3 ``metaclass`` keyword argument.
In Py2 compilation mode, a ``__metaclass__`` entry in the class
dict will still take precedence if not using Py3 metaclass syntax,
but only *after* creating the class dict (which may have been done
by a metaclass of a base class, see PEP 3115). It is generally
recommended to use the explicit Py3 syntax to define metaclasses
for Python types at compile time.
* The automatic C switch statement generation behaves more safely for
heterogeneous value types (e.g. mixing enum and char), allowing for
a slightly wider application and reducing corner cases. It now always
generates a 'default' clause to avoid C compiler warnings about
unmatched enum values.
* Fixed a bug where class hierarchies declared out-of-order could result
in broken generated code.
* Fixed a bug which prevented overriding const methods of C++ classes.
* Fixed a crash when converting Python objects to C++ strings fails.
Other changes
-------------
* In Py3 compilation mode, Python2-style metaclasses declared by a
``__metaclass__`` class dict entry are ignored.
* In Py3.4+, the Cython generator type uses ``tp_finalize()`` for safer
cleanup instead of ``tp_del()``.
0.19.2 (2013-10-13)
===================
Features added
--------------
Bugs fixed
----------
* Some standard declarations were fixed or updated, including the previously
incorrect declaration of ``PyBuffer_FillInfo()`` and some missing bits in
``libc.math``.
* Heap allocated subtypes of ``type`` used the wrong base type struct at the
C level.
* Calling the unbound method dict.keys/value/items() in dict subtypes could
call the bound object method instead of the unbound supertype method.
* "yield" wasn't supported in "return" value expressions.
* Using the "bint" type in memory views lead to unexpected results.
It is now an error.
* Assignments to global/closure variables could catch them in an illegal state
while deallocating the old value.
Other changes
-------------
0.19.1 (2013-05-11)
===================
Features added
--------------
* Completely empty C-API structs for extension type slots (protocols like
number/mapping/sequence) are no longer generated into the C code.
* Docstrings that directly follow a public/readonly attribute declaration
in a cdef class will be used as docstring of the auto-generated property.
This fixes ticket 206.
* The automatic signature documentation tries to preserve more semantics
of default arguments and argument types. Specifically, ``bint`` arguments
now appear as type ``bool``.
* A warning is emitted when negative literal indices are found inside of
a code section that disables ``wraparound`` handling. This helps with
fixing invalid code that might fail in the face of future compiler
optimisations.
* Constant folding for boolean expressions (and/or) was improved.
* Added a build_dir option to cythonize() which allows one to place
the generated .c files outside the source tree.
Bugs fixed
----------
* ``isinstance(X, type)`` failed to get optimised into a call to
``PyType_Check()``, as done for other builtin types.
* A spurious ``from datetime cimport *`` was removed from the "cpython"
declaration package. This means that the "datetime" declarations
(added in 0.19) are no longer available directly from the "cpython"
namespace, but only from "cpython.datetime". This is the correct
way of doing it because the declarations refer to a standard library
module, not the core CPython C-API itself.
* The C code for extension types is now generated in topological order
instead of source code order to avoid C compiler errors about missing
declarations for subtypes that are defined before their parent.
* The ``memoryview`` type name no longer shows up in the module dict of
modules that use memory views. This fixes trac ticket 775.
* Regression in 0.19 that rejected valid C expressions from being used
in C array size declarations.
* In C++ mode, the C99-only keyword ``restrict`` could accidentally be
seen by the GNU C++ compiler. It is now specially handled for both
GCC and MSVC.
* Testing large (> int) C integer values for their truth value could fail
due to integer wrap-around.
Other changes
-------------
0.19 (2013-04-19)
=================
Features added
--------------
* New directives ``c_string_type`` and ``c_string_encoding`` to more easily
and automatically convert between C strings and the different Python string
types.
* The extension type flag ``Py_TPFLAGS_HAVE_VERSION_TAG`` is enabled by default
on extension types and can be disabled using the ``type_version_tag`` compiler
directive.
* EXPERIMENTAL support for simple Cython code level line tracing. Enabled by
the "linetrace" compiler directive.
* Cython implemented functions make their argument and return type annotations
available through the ``__annotations__`` attribute (PEP 3107).
* Access to non-cdef module globals and Python object attributes is faster.
* ``Py_UNICODE*`` coerces from and to Python unicode strings. This is
helpful when talking to Windows APIs, which use compatible wchar_t
arrays for strings. Note that the ``Py_UNICODE`` type is otherwise
deprecated as of CPython 3.3.
* ``isinstance(obj, basestring)`` is optimised. In Python 3 it only tests
for instances of ``str`` (i.e. Py2 ``unicode``).
* The ``basestring`` builtin is mapped to ``str`` (i.e. Py2 ``unicode``) when
compiling the generated C code under Python 3.
* Closures use freelists, which can speed up their creation quite substantially.
This is also visible for short running generator expressions, for example.
* A new class decorator ``@cython.freelist(N)`` creates a static freelist of N
instances for an extension type, thus avoiding the costly allocation step if
possible. This can speed up object instantiation by 20-30% in suitable
scenarios. Note that freelists are currently only supported for base types,
not for types that inherit from others.
* Fast extension type instantiation using the ``Type.__new__(Type)`` idiom has
gained support for passing arguments. It is also a bit faster for types defined
inside of the module.
* The Python2-only dict methods ``.iter*()`` and ``.view*()`` (requires Python 2.7)
are automatically mapped to the equivalent keys/values/items methods in Python 3
for typed dictionaries.
* Slicing unicode strings, lists and tuples is faster.
* list.append() is faster on average.
* ``raise Exception() from None`` suppresses the exception context in Py3.3.
* Py3 compatible ``exec(tuple)`` syntax is supported in Py2 code.
* Keyword arguments are supported for cdef functions.
* External C++ classes can be declared nogil. Patch by John Stumpo. This fixes
trac ticket 805.
Bugs fixed
----------
* 2-value slicing of unknown objects passes the correct slice when the ``getitem``
protocol is used instead of the ``getslice`` protocol (especially in Python 3),
i.e. ``None`` values for missing bounds instead of ``[0,maxsize]``. It is also
a bit faster in some cases, e.g. for constant bounds. This fixes trac ticket 636.
* Cascaded assignments of None values to extension type variables failed with
a ``TypeError`` at runtime.
* The ``__defaults__`` attribute was not writable for Cython implemented
functions.
* Default values of keyword-only arguments showed up in ``__defaults__`` instead
of ``__kwdefaults__`` (which was not implemented). Both are available for
Cython implemented functions now, as specified in Python 3.x.
* ``yield`` works inside of ``with gil`` sections. It previously lead to a crash.
This fixes trac ticket 803.
* Static methods without explicitly named positional arguments (e.g. having only
``*args``) crashed when being called. This fixes trac ticket 804.
* ``dir()`` without arguments previously returned an unsorted list, which now
gets sorted as expected.
* ``dict.items()``, ``dict.keys()`` and ``dict.values()`` no longer return lists
in Python 3.
* Exiting from an ``except-as`` clause now deletes the exception in Python 3 mode.
* The declarations of ``frexp()`` and ``ldexp()`` in ``math.pxd`` were incorrect.
Other changes
-------------
0.18 (2013-01-28)
=================
Features added
--------------
* Named Unicode escapes ("\N{...}") are supported.
* Python functions/classes provide the special attribute "__qualname__"
as defined by PEP 3155.
* Added a directive ``overflowcheck`` which raises an OverflowException when
arithmetic with C ints overflow. This has a modest performance penalty, but
is much faster than using Python ints.
* Calls to nested Python functions are resolved at compile time.
* Type inference works across nested functions.
* ``py_bytes_string.decode(...)`` is optimised.
* C ``const`` declarations are supported in the language.
Bugs fixed
----------
* Automatic C++ exception mapping didn't work in nogil functions (only in
"with nogil" blocks).
Other changes
-------------
0.17.4 (2013-01-03)
===================
Bugs fixed
----------
* Garbage collection triggered during deallocation of container classes could lead to a double-deallocation.
0.17.3 (2012-12-14)
===================
Features added
--------------
Bugs fixed
----------
* During final interpreter cleanup (with types cleanup enabled at compile time), extension types that inherit from base types over more than one level that were cimported from other modules could lead to a crash.
* Weak-reference support in extension types (with a ``cdef __weakref__`` attribute) generated incorrect deallocation code.
* In CPython 3.3, converting a Unicode character to the Py_UNICODE type could fail to raise an overflow for non-BMP characters that do not fit into a wchar_t on the current platform.
* Negative C integer constants lost their longness suffix in the generated C code.
Other changes
-------------
0.17.2 (2012-11-20)
===================
Features added
--------------
* ``cythonize()`` gained a best effort compile mode that can be used to simply ignore .py files that fail to compile.
Bugs fixed
----------
* Replacing an object reference with the value of one of its cdef attributes could generate incorrect C code that accessed the object after deleting its last reference.
* C-to-Python type coercions during cascaded comparisons could generate invalid C code, specifically when using the 'in' operator.
* "obj[1,]" passed a single integer into the item getter instead of a tuple.
* Cyclic imports at module init time did not work in Py3.
* The names of C++ destructors for template classes were built incorrectly.
* In pure mode, type casts in Cython syntax and the C ampersand operator are now rejected. Use the pure mode replacements instead.
* In pure mode, C type names and the sizeof() function are no longer recognised as such and can be used as normal Python names.
* The extended C level support for the CPython array type was declared too late to be used by user defined classes.
* C++ class nesting was broken.
* Better checking for required nullary constructors for stack-allocated C++ instances.
* Remove module docstring in no-docstring mode.
* Fix specialization for varargs function signatures.
* Fix several compiler crashes.
Other changes
-------------
* An experimental distutils script for compiling the CPython standard library was added as Tools/cystdlib.py.
0.17.1 (2012-09-26)
===================
Features added
--------------
Bugs fixed
----------
* A reference leak was fixed in the new dict iteration code when the loop target was not a plain variable but an unpacked tuple.
* Memory views did not handle the special case of a NULL buffer strides value, as allowed by PEP3118.
Other changes
-------------
0.17 (2012-09-01)
=================
Features added
--------------
* Alpha quality support for compiling and running Cython generated extension modules in PyPy (through cpyext). Note that this requires at least PyPy 1.9 and in many cases also adaptations in user code, especially to avoid borrowed references when no owned reference is being held directly in C space (a reference in a Python list or dict is not enough, for example). See the documentation on porting Cython code to PyPy.
* "yield from" is supported (PEP 380) and a couple of minor problems with generators were fixed.
* C++ STL container classes automatically coerce from and to the equivalent Python container types on typed assignments and casts. Note that the data in the containers is copied during this conversion.
* C++ iterators can now be iterated over using "for x in cpp_container" whenever cpp_container has begin() and end() methods returning objects satisfying the iterator pattern (that is, it can be incremented, dereferenced, and compared (for non-equality)).
* cdef classes can now have C++ class members (provided a zero-argument constructor exists)
* A new cpython.array standard cimport file allows to efficiently talk to the stdlib array.array data type in Python 2. Since CPython does not export an official C-API for this module, it receives special casing by the compiler in order to avoid setup overhead on user side. In Python 3, both buffers and memory views on the array type already worked out of the box with earlier versions of Cython due to the native support for the buffer interface in the Py3 array module.
* Fast dict iteration is now enabled optimistically also for untyped variables when the common iteration methods are used.
* The unicode string processing code was adapted for the upcoming CPython 3.3 (PEP 393, new Unicode buffer layout).
* Buffer arguments and memory view arguments in Python functions can be declared "not None" to raise a TypeError on None input.
* c(p)def functions in pure mode can specify their return type with "@cython.returns()".
* Automatic dispatch for fused functions with memoryview arguments
* Support newaxis indexing for memoryviews
* Support decorators for fused functions
Bugs fixed
----------
* Old-style Py2 imports did not work reliably in Python 3.x and were broken in Python 3.3. Regardless of this fix, it's generally best to be explicit about relative and global imports in Cython code because old-style imports have a higher overhead. To this end, "from __future__ import absolute_import" is supported in Python/Cython 2.x code now (previous versions of Cython already used it when compiling Python 3 code).
* Stricter constraints on the "inline" and "final" modifiers. If your code does not compile due to this change, chances are these modifiers were previously being ignored by the compiler and can be removed without any performance regression.
* Exceptions are always instantiated while raising them (as in Python), instead of risking to instantiate them in potentially unsafe situations when they need to be handled or otherwise processed.
* locals() properly ignores names that do not have Python compatible types (including automatically inferred types).
* Some garbage collection issues of memory views were fixed.
* numpy.pxd compiles in Python 3 mode.
* Several C compiler warnings were fixed.
* Several bugs related to memoryviews and fused types were fixed.
* Several bug-fixes and improvements related to cythonize(), including ccache-style caching.
Other changes
-------------
* libc.string provides a convenience declaration for const uchar in addition to const char.
* User declared char* types are now recognised as such and auto-coerce to and from Python bytes strings.
* callable() and next() compile to more efficient C code.
* list.append() is faster on average.
* Modules generated by @cython.inline() are written into the directory pointed to by the environment variable CYTHON_CACHE_DIR if set.
0.16 (2012-04-21)
=================
Features added
--------------
* Enhancements to Cython's function type (support for weak references, default arguments, code objects, dynamic attributes, classmethods, staticmethods, and more)
* Fused Types - Template-like support for functions and methods CEP 522 (docs)
* Typed views on memory - Support for efficient direct and indirect buffers (indexing, slicing, transposing, ...) CEP 517 (docs)
* super() without arguments
* Final cdef methods (which translate into direct calls on known instances)
Bugs fixed
----------
* fix alignment handling for record types in buffer support
Other changes
-------------
* support default arguments for closures
* search sys.path for pxd files
* support C++ template casting
* faster traceback building and faster generator termination
* support inplace operators on indexed buffers
* allow nested prange sections
0.15.1 (2011-09-19)
===================
Features added
--------------
Bugs fixed
----------
Other changes
-------------
0.15 (2011-08-05)
=================
Features added
--------------
* Generators (yield) - Cython has full support for generators, generator expressions and PEP 342 coroutines.
* The nonlocal keyword is supported.
* Re-acquiring the gil: with gil - works as expected within a nogil context.
* OpenMP support: prange.
* Control flow analysis prunes dead code and emits warnings and errors about uninitialised variables.
* Debugger command cy set to assign values of expressions to Cython variables and cy exec counterpart $cy_eval().
* Exception chaining PEP 3134.
* Relative imports PEP 328.
* Improved pure syntax including cython.cclass, cython.cfunc, and cython.ccall.
* The with statement has its own dedicated and faster C implementation.
* Support for del.
* Boundschecking directives implemented for builtin Python sequence types.
* Several updates and additions to the shipped standard library .pxd files.
* Forward declaration of types is no longer required for circular references.
Bugs fixed
----------
Other changes
-------------
* Uninitialized variables are no longer initialized to None and accessing them has the same semantics as standard Python.
* globals() now returns a read-only dict of the Cython module's globals, rather than the globals of the first non-Cython module in the stack
* Many C++ exceptions are now special cased to give closer Python counterparts. This means that except+ functions that formerly raised generic RuntimeErrors may raise something else such as ArithmeticError.
* The inlined generator expressions (introduced in Cython 0.13) were disabled in favour of full generator expression support. This breaks code that previously used them inside of cdef functions (usage in def functions continues to work) and induces a performance regression for cases that continue to work but that were previously inlined. We hope to reinstate this feature in the near future.
0.14.1 (2011-02-04)
===================
Features added
--------------
* The gdb debugging support was extended to include all major Cython features, including closures.
* raise MemoryError() is now safe to use as Cython replaces it with the correct C-API call.
Bugs fixed
----------
Other changes
-------------
* Decorators on special methods of cdef classes now raise a compile time error rather than being ignored.
* In Python 3 language level mode (-3 option), the 'str' type is now mapped to 'unicode', so that cdef str s declares a Unicode string even when running in Python 2.
0.14 (2010-12-14)
=================
Features added
--------------
* Python classes can now be nested and receive a proper closure at definition time.
* Redefinition is supported for Python functions, even within the same scope.
* Lambda expressions are supported in class bodies and at the module level.
* Metaclasses are supported for Python classes, both in Python 2 and Python 3 syntax. The Python 3 syntax (using a keyword argument in the type declaration) is preferred and optimised at compile time.
* "final" extension classes prevent inheritance in Python space. This feature is available through the new "cython.final" decorator. In the future, these classes may receive further optimisations.
* "internal" extension classes do not show up in the module dictionary. This feature is available through the new "cython.internal" decorator.
* Extension type inheritance from builtin types, such as "cdef class MyUnicode(unicode)", now works without further external type redeclarations (which are also strongly discouraged now and continue to issue a warning).
* GDB support. http://docs.cython.org/src/userguide/debugging.html
* A new build system with support for inline distutils directives, correct dependency tracking, and parallel compilation. https://github.com/cython/cython/wiki/enhancements-distutils_preprocessing
* Support for dynamic compilation at runtime via the new cython.inline function and cython.compile decorator. https://github.com/cython/cython/wiki/enhancements-inline
* "nogil" blocks are supported when compiling pure Python code by writing "with cython.nogil".
* Iterating over arbitrary pointer types is now supported, as is an optimized version of the in operator, e.g. x in ptr[a:b].
Bugs fixed
----------
* In parallel assignments, the right side was evaluated in reverse order in 0.13. This could result in errors if it had side effects (e.g. function calls).
* In some cases, methods of builtin types would raise a SystemError instead of an AttributeError when called on None.
Other changes
-------------
* Constant tuples are now cached over the lifetime of an extension module, just like CPython does. Constant argument tuples of Python function calls are also cached.
* Closures have tightened to include exactly the names used in the inner functions and classes. Previously, they held the complete locals of the defining function.
* The builtin "next()" function in Python 2.6 and later is now implemented internally and therefore available in all Python versions. This makes it the preferred and portable way of manually advancing an iterator.
* In addition to the previously supported inlined generator expressions in 0.13, "sorted(genexpr)" can now be used as well. Typing issues were fixed in "sum(genexpr)" that could lead to invalid C code being generated. Other known issues with inlined generator expressions were also fixed that make upgrading to 0.14 a strong recommendation for code that uses them. Note that general generators and generator expressions continue to be not supported.
* Inplace arithmetic operators now respect the cdivision directive and are supported for complex types.
* Typing a variable as type "complex" previously gave it the Python object type. It now uses the appropriate C/C++ double complex type. A side-effect is that assignments and typed function parameters now accept anything that Python can coerce to a complex, including integers and floats, and not only complex instances.
* Large integer literals pass through the compiler in a safer way. To prevent truncation in C code, non 32-bit literals are turned into Python objects if not used in a C context. This context can either be given by a clear C literal suffix such as "UL" or "LL" (or "L" in Python 3 code), or it can be an assignment to a typed variable or a typed function argument, in which case it is up to the user to take care of a sufficiently large value space of the target.
* Python functions are declared in the order they appear in the file, rather than all being created at module creation time. This is consistent with Python and needed to support, for example, conditional or repeated declarations of functions. In the face of circular imports this may cause code to break, so a new --disable-function-redefinition flag was added to revert to the old behavior. This flag will be removed in a future release, so should only be used as a stopgap until old code can be fixed.
0.13 (2010-08-25)
=================
Features added
--------------
* Closures are fully supported for Python functions. Cython supports inner functions and lambda expressions. Generators and generator expressions are not supported in this release.
* Proper C++ support. Cython knows about C++ classes, templates and overloaded function signatures, so that Cython code can interact with them in a straight forward way.
* Type inference is enabled by default for safe C types (e.g. double, bint, C++ classes) and known extension types. This reduces the need for explicit type declarations and can improve the performance of untyped code in some cases. There is also a verbose compile mode for testing the impact on user code.
* Cython's for-in-loop can iterate over C arrays and sliced pointers. The type of the loop variable will be inferred automatically in this case.
* The Py_UNICODE integer type for Unicode code points is fully supported, including for-loops and 'in' tests on unicode strings. It coerces from and to single character unicode strings. Note that untyped for-loop variables will automatically be inferred as Py_UNICODE when iterating over a unicode string. In most cases, this will be much more efficient than yielding sliced string objects, but can also have a negative performance impact when the variable is used in a Python context multiple times, so that it needs to coerce to a unicode string object more than once. If this happens, typing the loop variable as unicode or object will help.
* The built-in functions any(), all(), sum(), list(), set() and dict() are inlined as plain for loops when called on generator expressions. Note that generator expressions are not generally supported apart from this feature. Also, tuple(genexpr) is not currently supported - use tuple([listcomp]) instead.
* More shipped standard library declarations. The python_* and stdlib/stdio .pxd files have been deprecated in favor of clib.* and cpython[.*] and may get removed in a future release.
* Pure Python mode no longer disallows non-Python keywords like 'cdef', 'include' or 'cimport'. It also no longer recognises syntax extensions like the for-from loop.
* Parsing has improved for Python 3 syntax in Python code, although not all features are correctly supported. The missing Python 3 features are being worked on for the next release.
* from __future__ import print_function is supported in Python 2.6 and later. Note that there is currently no emulation for earlier Python versions, so code that uses print() with this future import will require at least Python 2.6.
* New compiler directive language_level (valid values: 2 or 3) with corresponding command line options -2 and -3 requests source code compatibility with Python 2.x or Python 3.x respectively. Language level 3 currently enforces unicode literals for unprefixed string literals, enables the print function (requires Python 2.6 or later) and keeps loop variables in list comprehensions from leaking.
* Loop variables in set/dict comprehensions no longer leak into the surrounding scope (following Python 2.7). List comprehensions are unchanged in language level 2.
* print >> stream
Bugs fixed
----------
Other changes
-------------
* The availability of type inference by default means that Cython will also infer the type of pointers on assignments. Previously, code like this::
cdef char* s = ...
untyped_variable = s
would convert the char* to a Python bytes string and assign that. This is no longer the case and no coercion will happen in the example above. The correct way of doing this is through an explicit cast or by typing the target variable, i.e.
::
cdef char* s = ...
untyped_variable1 = <bytes>s
untyped_variable2 = <object>s
cdef object py_object = s
cdef bytes bytes_string = s
* bool is no longer a valid type name by default. The problem is that it's not clear whether bool should refer to the Python type or the C++ type, and expecting one and finding the other has already led to several hard-to-find bugs. Both types are available for importing: you can use from cpython cimport bool for the Python bool type, and from libcpp cimport bool for the C++ type. bool is still a valid object by default, so one can still write bool(x).
* ``__getsegcount__`` is now correctly typed to take a ``Py_size_t*`` rather than an ``int*``.
0.12.1 (2010-02-02)
===================
Features added
--------------
* Type inference improvements.
* There have been several bug fixes and improvements to the type inferencer.
* Notably, there is now a "safe" mode enabled by setting the infer_types directive to None. (The None here refers to the "default" mode, which will be the default in 0.13.) This safe mode limits inference to Python object types and C doubles, which should speed up execution without affecting any semantics such as integer overflow behavior like infer_types=True might. There is also an infer_types.verbose option which allows one to see what types are inferred.
* The boundscheck directive works for lists and tuples as well as buffers.
* len(s) and s.decode("encoding") are efficiently supported for char* s.
* Cython's INLINE macro has been renamed to CYTHON_INLINE to reduce conflict and has better support for the MSVC compiler on Windows. It is no longer clobbered if externally defined.
* Revision history is now omitted from the source package, resulting in a 85% size reduction. Running make repo will download the history and turn the directory into a complete Mercurial working repository.
* Cython modules don't need to be recompiled when the size of an external type grows. (A warning, rather than an error, is produced.) This should be helpful for binary distributions relying on NumPy.
Bugs fixed
----------
* Several other bugs and minor improvements have been made. This release should be fully backwards compatible with 0.12.
Other changes
-------------
0.12 (2009-11-23)
=================
Features added
--------------
* Type inference with the infer_types directive
* Seamless C++ complex support
* Fast extension type instantiation using the normal Python meme obj = MyType.__new__(MyType)
* Improved support for Py3.1
* Cython now runs under Python 3.x using the 2to3 tool
* unittest support for doctests in Cython modules
* Optimised handling of C strings (char*): for c in cstring[2:50] and cstring.decode()
* Looping over c pointers: for i in intptr[:50].
* pyximport improvements
* cython_freeze improvements
Bugs fixed
----------
* Many bug fixes
Other changes
-------------
* Many other optimisation, e.g. enumerate() loops, parallel swap assignments (a,b = b,a), and unicode.encode()
* More complete numpy.pxd
0.11.2 (2009-05-20)
===================
Features added
--------------
* There's now native complex floating point support! C99 complex will be used if complex.h is included, otherwise explicit complex arithmetic working on all C compilers is used. [Robert Bradshaw]
::
cdef double complex a = 1 + 0.3j
cdef np.ndarray[np.complex128_t, ndim=2] arr = \
np.zeros(10, np.complex128)
* Cython can now generate a main()-method for embedding of the Python interpreter into an executable (see #289) [Robert Bradshaw]
* @wraparound directive (another way to disable arr[idx] for negative idx) [Dag Sverre Seljebotn]
* Correct support for NumPy record dtypes with different alignments, and "cdef packed struct" support [Dag Sverre Seljebotn]
* @callspec directive, allowing custom calling convention macros [Lisandro Dalcin]
Bugs fixed
----------
Other changes
-------------
* Bug fixes and smaller improvements. For the full list, see [1].
|