Gabriele N Tornetta <phoenix1...@gmail.com> added the comment:

I think the issue on display here is that isinstance could cause a side effect, 
which I dare say it's unexpected (and not documented AFAIK). Are there any 
reasons why __class__ cannot be retrieved with object.__getattribute__ instead? 
In fact, considering that __getattribute__ could be overridden, this would be 
the right thing to do imho, else isinstance would break spectacularly, like in 
my previous example.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32683>
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