[issue36751] Changes in the inspect module for PEP 570

[mike bayer]

mike bayer <mike_mp at zzzcomputing.com> added the comment:

> We are talking again and again that we have a lot of old things in the standard library but it seems that removing them is also a problem.

I agree that the reason we have these deprecation warnings is so that we do get notified and we do fix them.  I think Signature is tough here because it is so different from how getfullargspec() worked which makes it difficult to port towards, and its very long and complicated invocation steps, with many loops, function and method calls, object creation overhead, none of which existed in Python 3.3's 20 line getfullargspec() implementation, is making me very hesitant to switch to it and I'm continuing to consider just writing my own thing that keeps the overhead as low as possible; but I will run timing tests on all versions of things before I do anything like that.

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<https://bugs.python.org/issue36751>
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