Gabriele N Tornetta <phoenix1...@gmail.com> added the comment:
@rhettinger
Apologies. You're totally right but I wasn't expecting this to become a lengthy
conversation.
So, to get closer to the initial issue, I believe that this ticket could be
closed provided that the documentation is improved by making developers aware
of the potential side effects of isinstance. I was doing some more experiments
and it looks like
def _isinstance(obj, classinfo):
return issubclass(type(obj), classinfo)
might be considered a "side-effects-free" version of isinstance. So perhaps one
thing to mention in the documentation is that `isinstance(obj, classinfo) !=
issubclass(type(obj), classinfo)` in general.
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<https://bugs.python.org/issue32683>
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