import os, sys, fileinput


print("Replaces instance of character in file")
char_to_replace = input("Character to replace>>")
replacement_char = input("Replacement Character>>")

file_name = input("Filename>>")

file = open(file_name, 'w+')

for line in fileinput.input(file_name):
        if char_to_replace  in line:
                print('Match')
        else:
                print("None found")
        file.write(line.replace(char_to_replace, replacement_char))
        file.close()

print('\n\nAll Done')