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