from functools import wraps

class logit():

    def __init__(self, logfile='out.log'):

        self.log = logfile

    def __call__(self, func):

        @wraps(func)

        def wrapper(*args, **kwargs):

            # args 为元组；kwargs 为字典

            info = func.__name__ + "was called"

            with open(self.log, 'rw') as f:

                f.write(info)

            self.notify()

            # 把传递进来的参数元组 args 和 参数字典 kwargs 展开，并调用原始函数

            return func(*args, **kwargs)

        return wrapper

    def notify(self):

        # TODO send email

        pass

def func1(arg1, arg2):

    print arg1, arg2

# 不使用装饰器

func = logit('test.log')(func1)

func(1, 2)

#使用装饰器

@logit('test.log')

def func2(arg1, arg2):

    print arg1, arg2

func2(3, 4)