[issue36918] ValueError warning in test_urllib due to io.IOBase destructor

[STINNER Victor]

Change by STINNER Victor <vstinner at redhat.com>:


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pull_requests: +13859
pull_request: https://github.com/python/cpython/pull/13996

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36918>
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