edit text files/ add lines if missing (regex)

[wardancer84]

update: got the first step working, i can now add stanza lines if they dont exist, and avoid duplicates. it's something

#!/usr/bin/env python

import re

config_file="stanza_test"
stanza_name="smittyjohn"

with open(config_file, 'r+') as fh:
    text = fh.read()
    if re.search('(?m)^' + stanza_name + ':', text):
        print('stanza found.')
    else:
        print('stanza not found.')
        fh.seek(0)
        fh.write(
            text + "\n"  + stanza_name + ":\n"
        )

root@lpgaixmgmtlx01:/root>./add_stanza.py
stanza not found.
root@lpgaixmgmtlx01:/root>./add_stanza.py
stanza found.
root@lpgaixmgmtlx01:/root>./add_stanza.py
stanza found.

root@lpgaixmgmtlx01:/root>cat stanza_test

smittyjohn:

shittyjohn: