[issue46722] Different behavior for functiools.partial between inspect.isfunction() and other inspect.is*function()

[Iliya Zinoviev]

New submission from Iliya Zinoviev <mrmar333 at yandex.ru>:

1) isfunction() returns `True` for partial object only when one passes `func` attribute of it.
2) For instance, `isgeneratorfunction()` and `iscoroutinefunction()` for partial obj work with passing partial obj as well as with passing `func` attr of this obj, when obj is partially applied generator function or partially applied coroutine function respectively.

I offer to unify behavior for handling partial object for r'inspect.is*function()' by the next way:
1) Add `functools._unwrap_partial()` to `inspect.isfunction()` as well as it were done in other r'inspect.is*function()'.

P.S.I'm ready to deal with this issue.  

Python 3.10.2 (main, Jan 15 2022, 19:56:27) [GCC 11.1.0]
Type 'copyright', 'credits' or 'license' for more information

Operating System: Manjaro Linux
KDE Plasma Version: 5.23.5
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.4.176-1-MANJARO (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-6200U CPU @ 2.30GHz
Memory: 11.6 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 520

----------
components: Library (Lib)
files: isfuncs_behavior.py
messages: 413077
nosy: IliyaZinoviev
priority: normal
severity: normal
status: open
title: Different behavior for functiools.partial between inspect.isfunction() and other inspect.is*function()
type: behavior
versions: Python 3.10
Added file: https://bugs.python.org/file50621/isfuncs_behavior.py

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46722>
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