Mauricio Villegas <[email protected]> added the comment:
> Doesn’t it do that with any built in function?
Sorry. I did not include what is the behavior for other classes. An example
could be calendar.Calendar. In this case the signature gives:
>>> from calendar import Calendar
>>> import inspect
>>> print(inspect.signature(Calendar.__init__))
(self, firstweekday=0)
>>> print(inspect.signature(Calendar))
(firstweekday=0)
Note that the signature gives firstweekday which is the only init parameter.
Calendar is not implemented with __new__ so getting the signature would be for
object, that does not include named parameters.
It also works fine when you implement a class with __new__. For example:
>>> class MyClass:
def __new__(cls, paramA, paramB=1):
obj = object.__new__(cls)
obj.paramA = paramA
obj.paramB = paramB
return obj
>>> print(inspect.signature(MyClass.__new__))
(cls, paramA, paramB=1)
>>> print(inspect.signature(MyClass))
(paramA, paramB=1)
I do think it is a bug specific to the datetime classes.
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<https://bugs.python.org/issue44618>
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