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This probably should have a blurb and whoever merges may require one.

1. bug occurs only when we run help(<module name>), in order to simulate separate module i have used exec. We cannot use classes in test cases because a class assumes __module__ of its containing test file. I am open to use other simpler approaches.
2. For the first test case CODE_SIMPLE, yes it is required to create an instance. For the second it is not required.

Alternatively, this can be fixed in pydoc, by accounting for methods without a __module__:

class A:
    def __new__(cls): pass

A.__new__.__module__ = None

# pydoc on A fails

warnings.deprecated just so happens to wrap object.__new__ which doesn't have a __module__, but the TypeError encountered in the issue can also happen in other cases.

@serhiy-storchaka Done. Pls review again

Alternatively, this can be fixed in pydoc, by accounting for methods without a __module__:

You are right. This is a more correct way to fix this issue.

See #129177.

@serhiy-storchaka Nice. Can we close this PR?