{Core} Python 3.11: Remove uses of deprecated inspect.getargspec

[mdboom]

inspect.getargspec has been deprecated since 3.0 in favor of its replacement inspect.getfullargspec.

This does change "vendored" code, and I couldn't find where that may require special treatment, if at all.

There is one other use of inspect.getargspec that is retained for backward compatibility with Python 2 that I didn't touch, but in reality that clause could also probably be removed since Python 2 is no longer supported.

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Description

Another step on the road to Python 3.11 compatibility. (See also #24109)

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[ghost]

Thank you for your contribution mdboom! We will review the pull request and get back to you soon.

[yonzhan]

remove deprecated dependencies on test

[mdboom]

Speaking to @iritkatriel in another forum, it sounds like the most future-proof option is to use inspect.signature. I'm going to update this PR to use that instead.

[mdboom]

remove deprecated dependencies on test

Sorry, is this a request of me? I'm not sure I understand.

[wangzelin007]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[jiasli]

This is not equivalent to the original code if self._user_callback contains *args and **kwargs, since signature's result includes *args (kind: VAR_POSITIONAL) and **kwargs (kind: VAR_KEYWORD) in parameters, but getargspec's result has dedicated varargs, keywords elements for them:

import inspect

def testfunc(a=1, b=2, *args, **kwargs):
    pass

print(len(inspect.getfullargspec(testfunc).args))
print(inspect.getfullargspec(testfunc).args)
print(len(inspect.signature(testfunc).parameters))
print(inspect.signature(testfunc).parameters)

Output:

2
['a', 'b']
4
OrderedDict([('a', <Parameter "a=1">), ('b', <Parameter "b=2">), ('args', <Parameter "*args">), ('kwargs', <Parameter "**kwargs">)])