I want to reorder sections of lines in text file with Python

Question

Ive got a shell file I’m opening as a text file with update commands, like this :

set line dnsConfig domain gggg.domain.com 
set line dnsConfig address 9.9.9.9
set line dnsConfig isUp true
set line dnsConfig parameterAlpha 133

...

I want to reorder this like so:

set line dnsConfig isUp true
set line dnsConfig parameterAlpha 133
set line dnsConfig domain gggg.domain.com 
set line dnsConfig address 9.9.9.9
...

This is just an illustration of my file(not a good one, I know), but I want to reorder only those items. I have experimented with Python’s readlines() and looping through that way with set string parameters, but am stuck on how to move forward with this.

Asked By: Krist0pher

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Source

Answer 1

this should reorder accordingly and leave the subsequent lines intact:

fname = 'test.txt'
new_lines = list()
with open(fname, 'r') as file:
    lines = file.read().splitlines()
    new_lines = lines

tmp = new_lines[0:4]
new_lines[0], new_lines[1] = tmp[2], tmp[3]
new_lines[2], new_lines[3] = tmp[0], tmp[1]

with open('out.txt', 'w') as new_file:
    for line in new_lines:
        new_file.write(line + 'n')

Get the lines from the file, reorder the ones you want, and write to the destination file — which should produce:

set line dnsConfig isUp true
set line dnsConfig parameterAlpha 133
set line dnsConfig domain gggg.domain.com
set line dnsConfig address 9.9.9.9
another line
and another

Answered By: yukako

I want to reorder sections of lines in text file with Python

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