Python module: profile,pstats

Profile and Pstats are the parser for Python code that can objectively look at the quality of the code and the resources used. There is a lot of help in debugging the program.

1. Using profile to analyze Python code

[Email protected] tmp]# vim profile12.py

#!/bin/env python
#!-*-Coding:utf-8-*-
Import profile

Def one (): #定义一个one函数

Sum=0
For I in range (10000):
Sum+=i
return sum

Def ():
Sum=0
For I in range (100000):
Sum+=i
return sum

def there ():
Sum=0
For I in range (100000):
Sum+=i
return sum

If __name__== "__main__":
Profile.run ("One ()", "result") #将结果保存到result文件中

Profile.run ("both ()")
Profile.run ("there ()")
[email protected] tmp]# python profile12.py
5 function calls in 0.010 CPU seconds
Ordered By:standard Name
Ncalls tottime percall cumtime percall filename:lineno (function)
1 0.003 0.003 0.003 0.003:0 (range)
1 0.000 0.000 0.000 0.000:0 (setprofile)
1 0.000 0.000 0.010 0.010 <string>:1 (<module>)
1 0.007 0.007 0.010 0.010 profile12.py:12 (both)
0 0.000 0.000 profile:0 (Profiler)
1 0.000 0.000 0.010 0.010 profile:0 (both ())
Ncalls: Number of function calls

Tottime: The total elapsed time of the function, eliminating the run time of the call child function in the function

Percall: (first percall) equals tottime/ncalls

Cumtime: The time at which the function and all its child functions are called to run, that is, when the function starts calling to the return time

Percall: (the second percall) is the average time the function runs once, equal to Cumtime/ncalls

Filename:lineno (function): Specific information for each function call

5 function calls in 0.008 CPU seconds
Ordered By:standard Name
Ncalls tottime percall cumtime percall filename:lineno (function)
1 0.001 0.001 0.001 0.001:0 (range)
1 0.000 0.000 0.000 0.000:0 (setprofile)
1 0.000 0.000 0.008 0.008 <string>:1 (<module>)
1 0.007 0.007 0.008 0.008 profile12.py:18 (there)
0 0.000 0.000 profile:0 (Profiler)
1 0.000 0.000 0.008 0.008 profile:0 (There ())

Thu May 5 17:30:09 result
5 function calls in 0.001 CPU seconds
Ordered By:standard Name
Ncalls tottime percall cumtime percall filename:lineno (function)
1 0.000 0.000 0.000 0.000:0 (range)
1 0.000 0.000 0.000 0.000:0 (setprofile)
1 0.000 0.000 0.001 0.001 <string>:1 (<module>)
1 0.001 0.001 0.001 0.001 profile12.py:6 (one)
1 0.000 0.000 0.001 0.001 profile:0 (one ())
0 0.000 0.000 profile:0 (Profiler)
[Email protected] tmp]#

2. Analyzing Python code with pstats

[Email protected] tmp]# vim profile12.py

#!/bin/env python
#!-*-Coding:utf-8-*-

Import Profile,pstats

Def one ():
Sum=0
For I in range (10000):
Sum+=i
return sum

If __name__== "__main__":
Profile.run ("One ()", "result") #将结果保存到result文件中

P=pstats. Stats ("result") #创建一上pstats变量
P.strip_dirs (). Sort_stats ( -1). Print_stats () #strip_dirs: 从所有模块名中去掉无关的路径信息

P.strip_dirs (). Sort_stats ("name"). Print_stats ()#sort_stats():把打印信息按照标准的module/name/line字符串进行排序

P.strip_dirs (). Sort_stats ("cumulative"). Print_stats (3)#print_stats():打印出所有分析信息

[email protected] tmp]# python profile12.py
Thu May 5 17:54:49 result
5 function calls in 0.001 CPU seconds
Ordered By:standard Name
Ncalls tottime percall cumtime percall filename:lineno (function)
1 0.000 0.000 0.000 0.000:0 (range)
1 0.000 0.000 0.000 0.000:0 (setprofile)
1 0.000 0.000 0.001 0.001 <string>:1 (<module>)
1 0.001 0.001 0.001 0.001 profile12.py:6 (one)
1 0.000 0.000 0.001 0.001 profile:0 (one ())
0 0.000 0.000 profile:0 (Profiler)

Thu May 5 17:54:49 result
5 function calls in 0.001 CPU seconds
Ordered by:function Name
Ncalls tottime percall cumtime percall filename:lineno (function)
1 0.000 0.000 0.001 0.001 <string>:1 (<module>)
1 0.001 0.001 0.001 0.001 profile12.py:6 (one)
1 0.000 0.000 0.001 0.001 profile:0 (one ())
0 0.000 0.000 profile:0 (Profiler)
1 0.000 0.000 0.000 0.000:0 (range)
1 0.000 0.000 0.000 0.000:0 (setprofile)

Thu May 5 17:54:49 result
5 function calls in 0.001 CPU seconds
Ordered by:cumulative Time
List reduced from 6 to 3 due to restriction <3>
Ncalls tottime percall cumtime percall filename:lineno (function)
1 0.001 0.001 0.001 0.001 profile12.py:6 (one)
1 0.000 0.000 0.001 0.001 profile:0 (one ())
1 0.000 0.000 0.001 0.001 <string>:1 (<module>)
[Email protected] tmp]#

This article is from the "Days Together" blog, please be sure to keep this source http://tongcheng.blog.51cto.com/6214144/1770508

Python module: profile,pstats