Message 358278 - Python tracker

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Author	terry.reedy
Recipients	Dutcho, asvetlov, martin.panter, sergiitk, serhiy.storchaka, terry.reedy, wumpus
Date	2019-12-11.20:46:16
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1576097177.5.0.74961546911.issue33762@roundup.psfhosted.org>
In-reply-to

Content
Looking at the tempfile code more, I agree with Serhiy that changing it should be rejected. Python is a duck-typed language (essentially what Martin said). People should not be over-zealous in using instance checks. The doc specifically says that TemporaryFile returns a file-like object https://docs.python.org/3/glossary.html#term-file-like-object which only require implementing the interface.

Looking at the tempfile code more, I agree with Serhiy that changing it should be rejected.  Python is a duck-typed language (essentially what Martin said). People should not be over-zealous in using instance checks.
 
The doc specifically says that TemporaryFile returns a *file-like object*
https://docs.python.org/3/glossary.html#term-file-like-object
which only require implementing the interface.

History
Date	User	Action	Args
2019-12-11 20:46:17	terry.reedy	set	recipients: + terry.reedy, asvetlov, martin.panter, serhiy.storchaka, wumpus, Dutcho, sergiitk
2019-12-11 20:46:17	terry.reedy	set	messageid: <1576097177.5.0.74961546911.issue33762@roundup.psfhosted.org>
2019-12-11 20:46:17	terry.reedy	link	issue33762 messages
2019-12-11 20:46:16	terry.reedy	create