import datetime

# 参考链接：https://foofish.net/python-decorator.html

class TimeException(Exception):

def __init__(self, exception_info):

super().__init__()

self.info = exception_info

def __str__(self):

return self.info

def timecheck(func):

def wrapper(*args, **kwargs):

if datetime.datetime.now().year == 2019:

func(*args, **kwargs)

else:

raise TimeException("out of time")

return wrapper

@timecheck

# @在此处的用法相当于timecheck(test()),且当运行到代码时，

# test函数已经消失了，再想调用其属性时会报错

def test(name):

print('hello {}'.format(name))

if __name__ == "__main__":

test('world')