python configparser output issue

Question

I want to add lines extracted from a file to a section , the line is not in the form of option=value, i use this program:

import configparser
f = open('inventory_file', 'r')
config = configparser.ConfigParser()
config.add_section('windows')
for line in f:
    if line[4] == '0':
        config.set('windows', line, 'None')

with open('example.cfg', 'w') as configfile:
    config.write(configfile)

inventory_file:

W00VL9959061
W01V09908960
W01V09907745
W01V09907746
W01V09908317
W01V09907748
W00VL9968055

i got this result in example.cfg:

[windows]
w01v09908960
 = None
w01v09907745
 = None
w01v09907746
 = None
w01v09908317
 = None
w01v09907748
 = None

i want something like this:

[windows]
w01v09908960
w01v09907745
w01v09907746
w01v09908317
w01v09907748

Any idea pls how i can modify my script to get the expected result

i tried it : i got this: cat example.cfg [windows] w01v09908960 = None w01v09907745 = None w01v09907746 = None w01v09908317 = None w01v09907748 = None i want to get a rid of = None — JL.Alex
– JL.Alex, Commented Dec 27, 2019 at 16:02
Don't use ConfigParser if you don't need a config file. Config files will have a parameter = value format; don't write a config file if you want an Ansible inventory file. — 9769953
– 9769953, Commented Dec 27, 2019 at 16:19
@JL.Alex Please edit the question if you want to add details. Comments don't support preformatted text. — wjandrea
– wjandrea, Commented Dec 27, 2019 at 16:59

Psi · Accepted Answer · 2019-12-27 17:17:13Z

1

Since Python 3.2 you can pass allow_no_value to the ConfigParser constructor (read this section of the manual) to allow keys without values. Then you can use config.set(section,key) to get what you want:

import configparser
f = open('inventory_file', 'r')
config = configparser.ConfigParser(allow_no_value=True)
config.add_section('windows')
for line in f:
  if line[4] == '0':
    config.set('windows', line.rstrip('\n'))

with open('example.cfg', 'w') as configfile:
  config.write(configfile)

The resulting file is:

[windows]
w01v09908960
w01v09907745
w01v09907746
w01v09908317
w01v09907748

edited Dec 27, 2019 at 17:17

answered Dec 27, 2019 at 17:13

Psi

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wjandrea · Accepted Answer · 2019-12-27 17:34:25Z

0

INI files have parameter-value pairs (*not always, it turns out. See Psi's answer), so what you're looking for is not an INI file.

In this case you can do it manually:

with open('inventory_file') as inv, open('example.cfg', 'w') as cfg:
    print('[windows]', file=cfg)
    for line in inv:
        if line[4] == '0':
            print(line, file=cfg, end='')

Output in example.cfg:

[windows]
W01V09908960
W01V09907745
W01V09907746
W01V09908317
W01V09907748

edited Dec 27, 2019 at 17:34

answered Dec 27, 2019 at 17:09

wjandrea

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