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python 计算程序运行用时，主要有两种方法：
time.time() 和 time.clock()
使用方法如下：
1. time.time()
import time start_time = time.time() # 程序开始时间 # function() 运行的程序 end_time =
time.time() # 程序结束时间 run_time = end_time - start_time # 程序的运行时间，单位为秒
print(run_time)
2. time.clock()
与time.time()用法一致。
import time start_time = time.clock() # 程序开始时间 # function() 运行的程序 end_time =
time.clock() # 程序结束时间 run_time = end_time - start_time # 程序的运行时间，单位为秒
print(run_time)
附：time.sleep() 让程序暂停指定的秒数，如 time.sleep(0.5)
二者的区别为：
time.time() 为wall time(墙上时钟)，是系统时钟的时间戳（1970-01-01 00:00:00 UTC 后经过的浮点秒数）。
time.clock() 为该程序运行后CPU运行的浮点秒数。不包含sleep用时。
所以在统计程序运行用时时，应按照自身需求进行选用。
