Nick Coghlan added the comment:
This proposal and patch look good to me. The current behaviour definitely isn't
desirable:
>>> import inspect
>>> inspect.Signature.from_function(1)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/ncoghlan/devel/py3k/Lib/inspect.py", line 1888, in from_function
raise TypeError('{!r} is not a Python function'.format(func))
TypeError: 1 is not a Python function
>>> inspect.Signature.from_builtin(1)
>>>
Signature.from_function() and Signature.from_builtin() should both also be
documented, but we may want to wait for PEP 457 and #17373 in Python 3.5 before
sorting all that out.
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