最早见过手写的，类似于下面这种：

 import datetime
 def time_1():

 begin = datetime.datetime.now()

 sum = 0

 for i in xrange(10000000):

  sum = sum + i

 end = datetime.datetime.now()

 return end-begin
print time_1()

输出如下： 

➜  Python python time_1.py

0:00:00.280797

另外一种方法是使用timeit模块，使用方法如下：

In [5]: import timeit
In [6]: timeit.timeit(\"sum(range(100))\")
Out[6]: 1.2272648811340332

还可以在命令行上使用这种timeit模块，如下：

➜ Python python -m timeit -s\"import time_1 as t\" \"t.time_1()\"
0:00:00.282044
10 loops, best of 3: 279 msec per loop

注意：timeit模块会多次运行程序以获得更精确的时间，所以需要避免重复执行带来的影响。比方说x.sort()这种操作，因为第一次执行之后，后边已经是排好的了，准确性就收到了影响。
 还有一种方法是使用cProfile模块，代码如下，名字为time_1.py:

 import datetime

 def time_1():

 begin = datetime.datetime.now()

 sum = 0

 for i in xrange(10000000):

  sum = sum + i

 end = datetime.datetime.now()

 return end-begin



 if __name__ == \'__main__\':

 print time_1()

import cProfile

 cProfile.run(\'time_1()\')

运行程序结果如下：　

➜ Python python time_1.py

0:00:00.282828

  2 function calls in 0.000 seconds 

 Ordered by: standard name

 ncalls tottime percall cumtime percall filename:lineno(function)

 1 0.000 0.000 0.000 0.000 :1()

 1 0.000 0.000 0.000 0.000 {method \'disable\' of \'_lsprof.Profiler\' objects}

Traceback (most recent call last):

 File \"time_1.py\", line 15, in 

 cProfile.run(\'main()\')

 File \"/usr/lib/python2.7/cProfile.py\", line 29, in run

 prof = prof.run(statement)

 File \"/usr/lib/python2.7/cProfile.py\", line 135, in run

 return self.runctx(cmd, dict, dict)

 File \"/usr/lib/python2.7/cProfile.py\", line 140, in runctx

 exec cmd in globals, locals

 File \"\", line 1, in 

NameError: name \'main\' is not defined

➜ Python vi time_1.py

➜ Python python time_1.py

0:00:00.284642

  5 function calls in 0.281 seconds

 Ordered by: standard name

 ncalls tottime percall cumtime percall filename:lineno(function)

 1 0.000 0.000 0.281 0.281 :1()

 1 0.281 0.281 0.281 0.281 time_1.py:3(time_1)

 2 0.000 0.000 0.000 0.000 {built-in method now}

 1 0.000 0.000 0.000 0.000 {method \'disable\' of \'_lsprof.Profiler\' objects}

一开始代码里最后一行写的是cProfile.run(\’main()\’)，提示没有main（），将main（）改成函数名字就可以了。

以上就是本文的全部内容，希望对大家学习python程序设计有所帮助。