read_write.py
#!/usr/bin/python# -*- coding: utf-8 -*-from sys import argvscript, filename = argvprint "We're going to erase %r." % filenameprint "If you don't want that, hit CTRL-C (^C)."print "If you want that, hit RETURN."raw_input("?")print "Opening the file ... \n"target = open(filename, 'w')print "Truncating the file ... Goodbye !\n"target.truncate()print "Now I'm going to ask you for 3 new lines."line1 = raw_input("line 1: ")line2 = raw_input("line 2: ")line3 = raw_input("line 3: ")print "I'm going to write these to the file."target.write(line1)target.write("\n")target.write(line2)target.write("\n")target.write(line3)target.write("\n")target.close()print "The content you just typed is:"target = open(filename, 'r')print target.read()print "And finally, we close it."target.close()