New submission from Serhiy Storchaka:
>>> import functools, inspect
>>> class A:
... f = functools.partialmethod((lambda self, x, y, *args: ...), 1)
...
>>> inspect.signature(A.f)
<Signature (self, y, *args)>
>>> class A:
... f = functools.partialmethod((lambda *args: ...), 1)
...
>>> inspect.signature(A.f)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/serhiy/py/cpython/Lib/inspect.py", line 3007, in signature
return Signature.from_callable(obj, follow_wrapped=follow_wrapped)
File "/home/serhiy/py/cpython/Lib/inspect.py", line 2757, in from_callable
follow_wrapper_chains=follow_wrapped)
File "/home/serhiy/py/cpython/Lib/inspect.py", line 2227, in
_signature_from_callable
return sig.replace(parameters=new_params)
File "/home/serhiy/py/cpython/Lib/inspect.py", line 2780, in replace
return_annotation=return_annotation)
File "/home/serhiy/py/cpython/Lib/inspect.py", line 2725, in __init__
raise ValueError(msg)
ValueError: duplicate parameter name: 'args'
----------
components: Library (Lib)
messages: 292184
nosy: ncoghlan, rhettinger, serhiy.storchaka, yselivanov
priority: normal
severity: normal
status: open
title: inspect.signature() doesn't support partialmethod without explicit self
parameter
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30149>
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