I’d wrote a function, that takes any python object and create file.py: a synopsis about the object with listing and describing all of it’s methods.

For example, when I pass 'str' to function, I get <class 'str'> synopsis.py, which includes such info block as:

"""
upper()
Return a copy of the string converted to uppercase.
"""
...

The 'upper' string is taken from dir(str).
The describing string is taken from getattr(str, 'upper').__doc__
But I can’t get THIS string yet: "def upper(self: LiteralString) -> LiteralString" (or, maybe, string like this).
Its appear in PyCharm Documentation Popup when You hover over the str.upper() method.

I had try to get access to source file for such methods (builtins.py) to get this annotation string somehow, but failed in it.