Obtain CPU usage (Python calls TOP command implementation)

This article is intended to use python to call the TOP command to obtain CPU usage, but there is no idea at the moment.
To obtain the CPU utilization, you can use the top command to redirect it easily. The command is as follows:

 
Top-Bi> cpuhistory. Log
Or
Top-bi | tee cpuhistory. Log
 

This will not be explained. If you are not familiar with it, please query the top help document. What we need to achieve here is to call the TOP command through Python and obtain the CPU utilization information.
Friends who have used popen will soon be able to think of something similar to the following:Code(This is the first code I wrote ,*_*):

  1  # ! /Usr/bin/python   
   2  
  3   Import  OS, time 
  4  
  5  time2sleep = 1.5 
  6   while  true: 
  7   Print  OS. popen ( '  top-bi-N 1   ' ). read (). split ( '  \ n   ') [2] 
  8  time. sleep (time2sleep) 

The principle looks correct, but there is a problem when running: the idle value of the CPU remains unchanged !!!
The reason is that the command "Top-bi-N 1" is executed separately. You will find that the CPU idle value in the output result remains unchanged.
So you cannot write this ......
Run the "top-bi-N 2" command on the terminal. You will find that the second value is changing every time. This is what we want to achieve.
Considering the time issue, it would be better to write the command like this: "Top-bi-N 2-D 0.02"
The Code is as follows:

 1   #  ! /Usr/bin/Python  
  2   '''  
  3   File: cpurate. py
  4   Author: Mike
  5  E-mail: Mike_Zhang@live.com
  6    ''' 
 7   Import OS, time
 8  
 9 Time2sleep = 2.5
 10   While True:
 11           Print INT (Time. Time ()),
 12           Print OS. popen ('  Top-bi-N 2-D 0.02  ' ). Read (). Split ( '  \ N  ' ) [1]. Split ( '  \ N  ' ) [2]
 13 Time. Sleep (time2sleep)

The execution result is as follows:

$./Cpurate. py
1328109437 CPU (s): 10.0% us, 20.0% Sy, 0.0% Ni, 70.0% ID, 0.0% wa, 0.0% hi, 0.0% Si, 0.0% St
1328109441 CPU (s): 0.0% us, 16.7% Sy, 0.0% Ni, 83.3% ID, 0.0% wa, 0.0% hi, 0.0% Si, 0.0% St
1328109444 CPU (s): 0.0% us, 16.7% Sy, 0.0% Ni, 83.3% ID, 0.0% wa, 0.0% hi, 0.0% Si, 0.0% St
1328109447 CPU (s): 12.5% us, 12.5% Sy, 0.0% Ni, 75.0% ID, 0.0% wa, 0.0% hi, 0.0% Si, 0.0% St
 

Okay, that's all. I hope it will help you.