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import difflib
def iter_diff(fr, to):
for l in difflib.unified_diff(fr.splitlines(), to.splitlines(), fromfile='L', tofile='R'):
l = l.rstrip('\n')
if l:
if l[0] == '-':
l = '[[bad]]' + l + '[[rst]]'
elif l[0] == '+':
l = '[[good]]' + l + '[[rst]]'
yield l
def pytest_assertrepr_compare(op, left, right):
return ['failed, show diff'] + list(iter_diff(left, right))
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