> the programmer may use the variable __name__ for some other purposes

Dunder names like `__name__` are reserved for the use of the interpreter. If the programmer uses them for "other purposes", the programmer is responsible for any failures.

You wouldn't write:

    class MyList(list):
        __len__ = "Hello world!"

and then be surprised that MyList is broken. You shouldn't be surprised if setting `__name__` to an invalid value breaks things either.