finds and replaces text in a file

text_replace.py

#!/usr/bin/env python3
from __future__ import print_function
from contextlib import closing
import os
import sys
import argparse
import fileinput

def text_replace(fileToSearch, textToSearch, textToReplace):
	with closing(fileinput.FileInput(fileToSearch, inplace=True, backup='.bak')) as file:
		for line in file:
			print(line.replace(textToSearch, textToReplace), end='')
	return True
        
def main():

	parser = argparse.ArgumentParser()
	parser.add_argument("file", help="Name of the file")
	parser.add_argument("find_text", help="Text to find in file")
	parser.add_argument("replace_text", help="Text to replace the found text")
	args = parser.parse_args()

	if not text_replace(args.file, args.find_text, args.replace_text):
		sys.exit(1)

if __name__ == "__main__":
	main()