new_contents: # -*- coding=utf-8 -*- 
  
  from sys import argv
  
  script, operation = argv # main.py, read, write 
  prompt = '> '
  
  def read():
  	print "程序将读取您以往的日记"
  	diary = open('diary.txt','r')
  	# if 是否为空，
  	# 	print "您的日记还没有内容。"
  	# else： 
  	print diary.read()
  
  def write():
  	print "您可以开始写日记了"
  	diary = open('diary.txt','a')
  	line = raw_input(prompt)
  	save = raw_input('是否保存？保存（y）/不保存（n）')
  	if save == 'y':
  		diary.write('\n' + line + '\n')
  		diary.close()
  		print "已保存。"
  	else: 
  		print "未保存。"
  		diary.close()
  
  
  if operation == 'read':
  	read()
  elif operation == 'write':
  	write()
  
subject: Create main2.0.py