[issue33762] temp file isn't IOBase

[Serhiy Storchaka]

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

Actually things are more complex. TemporaryFile is not a class, it is a function, so it does not make sense to use it with isinstance(). And if add support for TemporaryFile, NamedTemporaryFile and SpooledTemporaryFile should be supported too.

It may be easier to use a virtual subclassing: register IOBasePayload with a class which has an __instancecheck__() method which checks the existence of attributes "read" and "close".

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<https://bugs.python.org/issue33762>
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