[issue21253] unittest assertSequenceEqual can lead to Difflib.compare() crashing on mostly different sequences

[Gregory P. Smith]

Gregory P. Smith added the comment:

that seems reasonable.  unittest's assertSequenceEqual is using this to attempt to display a useful error message as to what the delta was; it should try harder to avoid difflib corner cases.

At the very least, unittest should recover from a difflib failure and report a test failure without the possibly nicer message.

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title: Difflib.compare() crashes on mostly different sequences -> unittest assertSequenceEqual can lead to Difflib.compare() crashing on mostly different sequences

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21253>
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