Direct change file with python use with use fileinput

1 2 3 4 5 6 7 8

import re import fileinput fname = "123.txt" #( file has line: Ala bala 123) for line in fileinput.FileInput(fname, inplace=1): line = re.sub(r'Ala bala \d{3}', "New Wine", line) print line