python --- output function of time decorator

import time
from functools import wraps


def get_running_time(func):
    # 使用wraps, 保证被装饰过的函数__name__的属性不变
    @wraps(func)
    def inner(*args, **kwargs):
        start_time = time.time()
        # print(start_time)
        res = func(*args, **kwargs)
        end_time = time.time()
        # print(end_time)
        print('the running time is {}'.format(end_time - start_time))
        return res

    return inner