Convert an entire folder of files from tabs to spaces

convert-tabs-to-spaces.py

from glob import iglob
import os
import sys

spaces_per_tab = 4


argc = len( sys.argv )

if argc < 2:
    print('no file argument specified')

directory = sys.argv[ 1 ]

for filename in iglob(directory + '**/*.lua', recursive=True):
    if not filename.endswith(".lua"): 
        continue
    old_filename = filename + ".old"

    os.rename( filename, old_filename )

    fn = open( filename, 'wb' )
    fo = open( old_filename, 'r' )

    for line in fo:
        fn.write( line.expandtabs( spaces_per_tab ).encode() )

    fn.close()
    fo.close()

    os.remove( old_filename )