[docs] [issue34500] Fix ResourceWarning in difflib.py

[Mickaël Schoentgen]

Change by Mickaël Schoentgen <contact at tiger-222.fr>:


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keywords: +patch
pull_requests: +8397
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34500>
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