Removing spaces and empty lines from a file Using Python

Question

I have a file which contains a value 2000,00.

But it contains spaces after 2000,00 and empty lines.

I want to remove all the spaces and empty lines, if some

Answer 1

Functional one :)

import string
from itertools import ifilter, imap

print '\n'.join(ifilter(None, imap(string.strip, open('data.txt'))))
# for big files use manual loop over lines instead of join

Usage:

$ yes "2000,00  " | head -n 100000 > data.txt
$ python -c "print '\n'*100000" >> data.txt
$ wc -l data.txt 
200001 data.txt
$ python filt.py > output.txt
$ wc -l output.txt 
100000 output.txt