[issue34924] inspect.signature isn't aware that types.MethodType can wrap any callable

[Dan Snider]

New submission from Dan Snider <mr.assume.away at gmail.com>:

I actually noticed this due to it confusingly breaking IDLE call tips and code completion.

>>> import inspect
>>> from types import MethodType

>>> bound_len = MethodType(len, 'abc')
>>> bound_len()
3

>>> inspect.signature(bound_len)
<Signature ()>

>>> inspect.signature(len)
<Signature (obj, /)>

----------
components: Library (Lib)
messages: 327313
nosy: bup
priority: normal
severity: normal
status: open
title: inspect.signature isn't aware that types.MethodType can wrap any callable
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34924>
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