[issue31271] an assertion failure in io.TextIOWrapper.write

[Roundup Robot]

Changes by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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keywords: +patch
pull_requests: +3540
stage: backport needed -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31271>
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