New submission from Takuo Matsuoka <motogeom...@gmail.com>:
In the creation of a class, it looks as if the value of the variable
__name__ gets assigned automatically to the variable __module__ in the
class body. However, the correct name space where the value of
__name__ should be looked up is NOT the mapping object returned by the
method __prepare__
of the metaclass. In the class body, the programmer may use the
variable __name__ for some other purposes, and might not notice
__module__ was messed up. Here's a code which produces a problem.
```
class C(type):
@classmethod
def __prepare__(cls, /, *args, **kwargs):
return dict(__name__ = "whatever")
class O(metaclass=C):
print(__module__) # "whatever" printed
```
Consequently,
>>> O.__module__
'whatever'
The issue is different from but seems related to
https://bugs.python.org/issue28869
I haven't figured out the exact relation.
Thanks.
----------
components: Interpreter Core
messages: 416118
nosy: Takuo Matsuoka
priority: normal
severity: normal
status: open
title: Wrong value assigned automatically to the variable __module__ in the
class body.
type: behavior
versions: Python 3.9
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue47136>
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