Access private members each other using decorator as a class instance method

decorator.py

# -*- coding:utf-8 -*-


class Foo(object):
    def __init__(self):
        self.__private_foo = 'private foo'

    def decorator(self, option):
        print 'decorator argument:', option
        print self.__private_foo

        def set_decorator(func):
            print func

            def wrapper(instance, name):
                private_variable = self.get_private_var(instance, '__private_bar')
                return 'func result: %s with %s' % (func(instance, name), private_variable)

            return wrapper

        return set_decorator

    def get_private_var(self, instance, name):
        return getattr(instance, '_%s%s' % (instance.__class__.__name__, name))

foo = Foo()


class Bar(object):
    def __init__(self):
        self.bar = 'bar'
        self._protected_bar = 'protected bar'
        self.__private_bar = 'private bar'

    @foo.decorator('off')
    def hello(self, name):
        return name


bar = Bar()
print bar.hello('Junsang')

Result:

$ python decorator.py
decorator argument: off
private foo
<function hello at 0x1005c8410>
func result: Junsang with private bar