python parse file and put in for loop

Question

I want to parse httpd_ from chkconfig output using python for loop or whatever the easy way.

[spatel@04 ~]$ /sbin/chkconfig --list| grep httpd_
httpd_A    0:off   1:off   2:on    3:on    4:on    5:on    6:off
httpd_B      0:off   1:off   2:off   3:on    4:on    5:on    6:off
httpd_C      0:off   1:off   2:on    3:on    4:on    5:on    6:off

I know how to do in bash but i want same thing in python.

[spatel@04 ~]$ for qw in `/sbin/chkconfig --list| grep httpd_ | awk '{print $1}'`
> do
> echo $qw
> done
httpd_A
httpd_B
httpd_C

How to do it in python? my python version is

[root@04 ~]# python -V
Python 2.4.3

Aside: your bash is somewhat convoluted. Try: /sbin/chkconfig --list | awk '/^httpd_/ { print $1 }'. for and grep and backticks are not required. — Robᵩ
– Robᵩ, Commented Mar 6, 2013 at 15:36
@Robᵩ that is so sweet. good to know we can use awk for extract string.. upvote for it. — Satish
– Satish, Commented Mar 6, 2013 at 15:46

Martijn Pieters · Accepted Answer · 2013-03-06 15:38:12Z

3

Split the line on whitespace using .split() and test if the first element starts with a string using .startswith():

import subprocess

output = subprocess.check_output(['chkconfig', '--list'])

for line in output.splitlines():
    if line.startswith('httpd_'):
        print line.split()[0]

For older python versions, use a Popen() call directly:

output = subprocess.Popen(['chkconfig', '--list'], stdout=subprocess.PIPE).stdout

for line in output:
    if line.startswith('httpd_'):
        print line.split()[0]

edited Mar 6, 2013 at 15:38

answered Mar 6, 2013 at 15:31

Martijn Pieters

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6 Comments

Satish Over a year ago

AttributeError: 'module' object has no attribute 'check_output'

Satish Over a year ago

My version is Python 2.4.3 (#1, May 5 2011, 16:39:10)

Martijn Pieters Over a year ago

@Satish: ah, old, old python version then.

kvivek Over a year ago

All latest Linux machines are having Python2.6 which does not have attribute check_output. AttributeError: 'module' object has no attribute 'check_output'.

Martijn Pieters Over a year ago

@kvivek: that returns the exit code, useless if you want to read it's stdout instead.

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