python限制函数调用次数

使用注解实现。注解可以是函数，也可以是类的实例。只要是可调用的即可。

# encoding:utf-8


class CallTimesLimit(object):
    def __init__(self, max):
        print "init CallTimesLimit"
        self.__max = max
        self.__count = 0

    def __call__(self, fun):
        print "call __call__"
        self.__fun = fun
        return self.__proxy

    def __proxy(self, *args, **kwargs):
        print "proxy"
        self.__count += 1
        if self.__count > self.__max:
            print "adsfasdfasdf"
            raise Exception("{f} is called over {limit} times".format(f=self.__fun.__name__,
                                                                      limit=self.__max))
        else:
            self.__fun(*args, **kwargs)


@CallTimesLimit(3)
def foo(x):
    print x


if __name__ == '__main__':
    foo(2)
    foo(2)
    foo(2)
    foo(3)