核心编程答案（第三章）

#!/usr/bin/env python
# encoding: utf-8

import os
ls = os.linesep
fname = raw_input(‘Enter file name: ‘)

all = []

try:
    fobj = open(fname, ‘r‘)
    print "‘%s already exists‘" % fname
except IOError, e:
    print "\nEnter lines (‘.‘ by itself to quite). \n"
    while True:
        entry = raw_input(‘>‘)
        if entry == ‘.‘:
            break
        else:
            all.append(entry)
    fobj = open(fname, ‘w‘)
    fobj.writelines(‘%s%s‘ % (x, ls) for x in all)
    fobj.close()
    print "Done!"