[issue22831] Use "with" to avoid possible fd leaks

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

self.addCleanup(f.close) can not be used if the same file should be opened several times in the test. It can not be used also if the file is deleted in the test or in tearDown().

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue22831>
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