Method add_foreign_method

Lib/test/test_code.py:279–284

(cls, name, f)

            return c.replace(co_freevars=c.co_freevars + ('__class__',), co_code=bytes([COPY_FREE_VARS, 1])+c.co_code)

        def add_foreign_method(cls, name, f):
            code = new_code(f.__code__)
            assert not f.__closure__
            closure = create_closure(cls)
            defaults = f.__defaults__
            setattr(cls, name, FunctionType(code, globals(), name, defaults, closure))

        class List(list):
            pass