Python将特定时间附加到列表

Question

I am trying to append 5 times to a list and calculate the average of the values. Since the top command is looping forever, I am not able to do so.

#/usr/bin/python
import subprocess

values= []
cpu=subprocess.call(["top -b | awk '/sshd/ {print  $9}'"], shell=True)
values.append(cpu)
print values

Output:

3.0
0.3
2.3
2.2

Answer 1

First, You need to use subprocess.check_output if you want cpu to have output of the command. .call does not return output of the command.

Second you can specify -n 5 in you top command.

#/usr/bin/python
import subprocess

cpu = subprocess.check_output(["top -n 5 -b | awk '/sshd/ {print  $9}'"], shell=True)
values = cpu.split()
print values