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Full Discussion: Python: Suppress lines not substituted
Top Forums Shell Programming and Scripting Python: Suppress lines not substituted Post 302980695 by zaxxon on Thursday 1st of September 2016 03:07:33 AM
Old 09-01-2016
Python: Suppress lines not substituted
Hi all,

I started playing around with Python (2.6.6) trying to parse a file. No matter what I tried so far I am not able to print only the lines/group/backreference that have been affected by the substitution. Instead I get also the other lines too

File to parse:
Code:
        [serverClass:One] some more text
                config = alpha.cfg

        [serverClass:Two] some more text
                config = bravo.cfg

        [serverClass:Three] some more text
                config = charly.cfg

Current code:
Code:
import re

f = open('infile', 'r')

lines = f.readlines()

for line in lines:
        x = re.sub(r"^\s*\[serverClass:([^]]*)\] .*$", r"\1", line.rstrip())
        print(x)

I assume there is something needed like the behavior of sed's -n and /p to basically print nothing but the lines that have been matched.

Output:
Code:
$ python ./mach.py
One
                config = alpha.cfg

Two
                config = bravo.cfg

Three
                config = charly.cfg

Expected output:
Code:
One
Two
Three

I saw that there are more functions/methods in the module re like re.group etc. but I would like to know why it doesn't work with my example.

Thanks in forward for a hint with this rather basic problem.

Cheers
zaxxon
 

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