import time
import logging
logging.basicConfig(level=logging.DEBUG)
def timer(func):
    """
    函数执行计时器
    """
    def inner(*args, **kwargs):
        start = time.time()
        ret = func(*args, **kwargs)
        end = time.time()
        logging.info("time: {:.2f} s".format(end - start))
        return ret
    return inner

@timer
def function():
  pass 
function()