Sergii Tkachenko <h...@sergii.org> added the comment:

Confirming this to be a thing on Python 3.7.5 / OS X 10.15.1.

In [31]: f = tempfile.NamedTemporaryFile()
In [32]: isinstance(f, io.IOBase)
Out[32]: False

----------
nosy: +sergiitk
versions: +Python 3.7 -Python 3.6

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33762>
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