本文参考了

装饰器的实质是把函数当做参数传递给另一个函数（装饰函数）并返回。 先看一个简单的例子：

from functools import wrapsdef logit(func):    @wraps(func)    def with_logging(*args, **kwargs):        print(func.__name__ + " was called")        return func(*args, **kwargs)    return with_logging@logitdef addition_func(x):   """Do some math."""   return x + xresult = addition_func(4)# Output: addition_func was called

再看下带参数的装饰器：

def logit(logfile='out.log'):    def logging_decorator(func):        @wraps(func)        def wrapped_function(*args, **kwargs):            log_string = func.__name__ + " was called"            print(log_string)            # 打开logfile，并写入内容            with open(logfile, 'a') as opened_file:                # 现在将日志打到指定的logfile                opened_file.write(log_string + '\n')            return func(*args, **kwargs)        return wrapped_function    return logging_decorator@logit(logfile='func2.log')def myfunc2():    passmyfunc2()