CODEWITHSUNDEEP
python
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Reputation: 155

python not appending to each line in file in directory

I am trying to append a string ("testing123") to each line of every file in my current working directory (cache/configs). This is what I've done:

import os

for file in os.listdir('cache/configs'):
    with open('cache/configs/'+file, "r") as f:
        lines = f.readlines()
        for line in lines:
            line = line+"testing123"

The command goes through without error, but nothing is changing. At face value my logic seems cogent. Where am I going wrong? Thanks.

[Python version 3.6]

Upvotes: 0

Views: 57

Answers (2)

Bhakta Raghavan
Bhakta Raghavan

Reputation: 724

How about this?

import os

for file in os.listdir('cache/configs'):
    cmd = "sed -i -e 's/$/ testing123/' cache/configs/{}".format(file)
    os.system(cmd)

Upvotes: 0

alexisdevarennes
alexisdevarennes

Reputation: 5632

You're never saving the change.

import os

for file in os.listdir('cache/configs'):
    with open('cache/configs/'+file, "r+") as f:
        lines = f.readlines()
        for i, line in enumerate(lines):
            lines[i] = line.rstrip()+"testing123"
        f.writelines(lines)

Upvotes: 3

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