[issue44618] inspect.signature does not work for datetime classes

Mauricio Villegas added the comment: I am not sure if this affects all built-in classes, assuming that by built-in it means that `SOMEOBJECT.__class__.__module__ == 'builtins'`. For example I have C++ library that is compiled into a python module using swig. It is available as a docker image

[issue44618] inspect.signature does not work for datetime classes

Mauricio Villegas added the comment: Also happens in python 3.10. === Python 3.10.0b4 === (*args, **kwargs) (self, /, *args, **kwargs) Traceback (most recent call last): ... ValueError: no signature found for builtin type -- versions: +Python 3.10 ___

[issue44618] inspect.signature does not work for datetime classes

Change by hongweipeng : -- keywords: +patch nosy: +hongweipeng nosy_count: 2.0 -> 3.0 pull_requests: +25721 stage: -> patch review pull_request: https://github.com/python/cpython/pull/27177 ___ Python tracker __

[issue44618] inspect.signature does not work for datetime classes

Guido van Rossum added the comment: You're right, it seems specific to built-in *classes* like those in datetime. We get the same with inspect.signature(int), since int is also a built-in class. I don't know who maintains inspect, but it's not me. :-( --

[issue44618] inspect.signature does not work for datetime classes

Mauricio Villegas 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(inspec

[issue44618] inspect.signature does not work for datetime classes

Guido van Rossum added the comment: Doesn’t it do that with any built in function? Try Len or open, for example. I think that’s a feature, at least not a bug specific to date time. -- nosy: +gvanrossum ___ Python tracker

[issue44618] inspect.signature does not work for datetime classes

Change by Mauricio Villegas : -- components: +Library (Lib) type: -> behavior ___ Python tracker ___ ___ Python-bugs-list mailing l

[issue44618] inspect.signature does not work for datetime classes

New submission from Mauricio Villegas : Classes in the datetime module are implemented using __new__ with some named parameters. I want to be able to inspect their signature to know which are the names of the parameters it accepts like it works for most classes. However, this does not work fo