使用装饰器记录函数调用次数(函数是对象)

def counter(func):

    """

    A decorator that counts and prints the number of times a function has been executed

    """

    def wrapper(*args, **kwargs):

        wrapper.count = wrapper.count + 1

        res = func(*args, **kwargs)

        print "{0} has been used: {1}x".format(func.__name__, wrapper.count)

        return res

    wrapper.count = 0

    return wrapper

函数是对象所以可以为他添加属性，利用这个属性来记录次数