[issue42096] zipfile.is_zipfile incorrectly identifying a gzipped file as a zip archive

[Irit Katriel]

Change by Irit Katriel <iritkatriel at yahoo.com>:


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nosy: +gregory.p.smith, vstinner

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42096>
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