New submission from Antonio Caceres <cont...@antonio-caceres.com>:
The __str__ method of the inspect.Parameter class in the standard library's inspect module does not include subscripted types in annotations. For example, consider the function foo(a: list[int]). When I run str(inspect.signature(foo)), I would expect the returned string to be '(a: list[int])', but instead the string is '(a: list)'. (I have tested this on Python 3.9.7, but the code I believe is the problem is on the branches for versions 3.9-3.11.) >From a first glance at the source code, the problem is in the >inspect.formatannotation function. If the annotation is a type, the >formatannotation uses the __qualname__ attribute of the annotation instead of >its __repr__ attribute. Indeed, list[int].__qualname__ == 'list' and >repr(list[int]) == 'list[int]'. This problem was probably code that should >have been changed, but never was, after PEP 585. The only workarounds I have found is to implement an alternative string method that accepts inspect.Signature or subclass inspect.Parameter and override the __str__ method. ---------- components: Library (Lib) messages: 400972 nosy: antonio-caceres priority: normal severity: normal status: open title: inspect.Parameter.__str__ does not include subscripted types in annotations type: behavior versions: Python 3.10, Python 3.11, Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue45091> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
