#!/usr/bin/python3.4 snakeg = open('snakeg', 'r') snaked = open('snaked', 'w') for ligne in snakeg.readlines(): n = len(ligne)-1 for i in range(n): towrite = ligne[n-i] if (towrite == '/') : snaked.write('\\') elif (towrite == '\\') : snaked.write('/') else : snaked.write(towrite); snakeg.close() snaked.close()