python decorator with callable class

python_decorator

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# example of a decorator from http://xahlee.info/perl-python/python_decorator.html


class Foo:
    def __init__(self, method):
        self.__method = method

    def __call__(self, arg):
        return self.__method(arg - 1)

def gg(call_fun):
    print "gg called"
    foo_instance = Foo(call_fun)
    return foo_instance

@gg  # ← this is decorator
def ff(x):
    print "ff called"
    return x+1

print ff(3)