bpo-38337: Change getattr to inspect.getattr_static

[3j14]

When calling inspect.getmembers on a class that has a property (@property), the property will be called by the getattr call in getmembers.

Example:

import inspect

class Example:
    def __init__(self, var):
        self._var = var
        print('__init__')

    def foo(self, bar):
        print(bar)
        print('foo')

    @property
    def var(self):
        print('Access property')
        return self._var


if __name__ == '__main__':
    ex = Example('Hello')
    print('--- getmembers from instance ---')
    print(inspect.getmembers(ex))
    print('--- getmembers from class    ---')
    print(inspect.getmembers(Example))

Result:

__init__
--- getmembers from instance ---
Access property
[('__class__', <attribute '__class__' of 'object' objects>), ..., ('var', 'Hello')]
--- getmembers from class    ---
[('__class__', <attribute '__class__' of 'object' objects>), ..., ('var', <property object at 0x...>)]

Expected (new result):

__init__
--- getmembers from instance ---
[('__class__', <attribute '__class__' of 'object' objects>), ..., ('var', <property object at 0x...>)]
--- getmembers from class    ---
[('__class__', <attribute '__class__' of 'object' objects>), ..., ('var', <property object at 0x...>)]

https://bugs.python.org/issue38337