装饰器

import datetime
import time
from functools import wraps,update_wrapper


def logger(wapped):
    @wraps(wapped) # partial function
    def wapper(*args, **kwargs):
        """
        I'm wapper
        """
        starttime = datetime.datetime.now()
        ret = wapped(*args, **kwargs)
        endtime = (datetime.datetime.now() - starttime).total_seconds()
        print("{},{}".format(wapped.__name__, endtime))
        return ret

    # wapper.__name__ = wapped.__name__
    # wapper.__doc__ = wapped.__doc__
    # 等价
    # update_wrapper(wapper, wapped)
    return wapper


@logger  # add = logger(add)
def add(x:int, y:int):
    """
    I'm add
    """
    time.sleep(1)
    ret = x + y
    print(ret)
    return ret


add(3, 4)
print(add.__name__, add.__doc__, add.__annotations__)