python 时间戳装饰器

import time
from functools import wraps

def timer(func):
    @wraps(func)
    def inner(*args, **kwargs):
        start = time.time()
        res = func(*args, **kwargs)
        end = time.time()
        print("{0}运行耗时: {1:.2f}".format(func.__name__, end - start))
        return res
    return inner


@timer
def counter(x):
    print("counter running!!!")
    time.sleep(3)
    return x


x = counter(100)
print(counter.__name__)
print(x)