Python - How to add a space string (' ') to the end of every line in a text/conf file

Question

I have a config file that i would like to add a space (\' \') to the end of every line in the file

File example:

#xxx configuration
IPad         


        

Answer 1

You can use fileinput with inplace=True to update the original file:

import fileinput
import sys
for line in fileinput.input("in.txt",inplace=True):
    sys.stdout.write("{} \n".format(line.rstrip()))

Or use a tempfile.NamedTemporaryFile with shutil.move:

from tempfile import NamedTemporaryFile
from shutil import move

with open("in.txt") as f, NamedTemporaryFile("w",dir=".", delete=False) as temp:   
    for line in f:
       temp.write("{} \n".format(line.rstrip()))
move(temp.name,"in.txt")