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Title: Incorrect behavior of inspect.signature(f).bind
Type: behavior Stage:
Components: Versions: Python 3.9, Python 3.8
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: slavkostrov
Priority: normal Keywords:

Created on 2021-01-16 16:30 by slavkostrov, last changed 2022-04-11 14:59 by admin.

Messages (1)
msg385143 - (view) Author: Slava Kostrov (slavkostrov) Date: 2021-01-16 16:30
>>> def foo(a, /, b=1, **kwargs): pass
>>> foo(a=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: foo() missing 1 required positional argument: 'a'

>>> inspect.signature(foo).bind(a=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "\Python\Python39\lib\", line 3062, in bind
    return self._bind(args, kwargs)
  File "\Python\Python39\lib\", line 2958, in _bind
    raise TypeError(msg) from None
TypeError: 'a' parameter is positional only, but was passed as a keyword

There is a different behaviour between a simple function call and inspect.signature(foo).bind - different TypeError messages.

I think inspect should check for VARKEYWORDS before throwing an error and throw only if there are not.
Date User Action Args
2022-04-11 14:59:40adminsetgithub: 87106
2021-01-16 16:30:52slavkostrovcreate