Private Method

import inspect


def private(method):
    def func(self, *args, **kwargs):
        print("Private method call")
        outer_frame = inspect.stack()[1][0]
        if 'self' not in outer_frame.f_locals or outer_frame.f_locals['self'] is not args[0]:
            raise Exception('Call to a private method outside!!!')
        method(self)
    return func


class Some:
    def foo(self):
        print("Foo!")

    def bar(self):
        print("Bar!")
        self.baz(self)

    @private
    def baz(self):
        print("Baz!")


some = Some()

some.foo()
some.bar()
some.baz()