Python实现的用户登录系统功能示例，看看吧!

　　本文实例讲述了Python实现的用户登录系统功能。分享给大家供大家参考，具体如下：

　　有N,E,Q三个选择，若选择Q或者中断，则系统退出。若其他选项，则持续让用户选择。

#!/usr/bin/env python

db Stream Vera Sans Mono', 'Courier New', Courier, monospace !important; float: none !important; border-top-width: 0px !important; border-bottom-width: 0px !important; height: auto !important; color: rgb(0, 102, 153) !important; vertical-align: baseline !important; overflow: visible !important; top: auto !important; right: auto !important; font-weight: bold !important; left: auto !important; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;" class="py keyword">={}

defnewuser():

  prompt ='login desired: '

  while1:

    name =raw_input(prompt)

    ifdb.has_key(name):

      prompt ='name taken, try another: '

      continue

    else:

      break

  pwd =raw_input('passwd: ')

  db[name] =pwd

defolduser():

  name =raw_input('login: ')

  pwd =raw_input('passwd: ')

  passwd =db.get(name)

  ifpasswd ==pwd:

    pass

  else:

    print'login incorrect'

    return

  print'welcome back', name

defshowmenu():##主函数名

  prompt ="""

(N)ew User Login

(E)xisting User Login

(Q)uit

Enter choice: """

  done =0##控制循环的控制器

  whilenotdone:

    chosen =0##控制循环的控制器

    whilenotchosen:

      try:

        choice =raw_input(prompt)[0]

      except(EOFError, KeyboardInterrupt):

        choice ='q'

      print'You picked: [%s]'%choice

      ifchoice notin'neq':##非neq继续小循环

        print'invalid menu option, try again'

      else:

        chosen =1##跳出小循环

    ifchoice =='q': done =1##跳出大循环

    ifchoice =='n': newuser()

    ifchoice =='e': olduser()

if__name__ =='__main__':

  showmenu()

　　运行结果：

Python实现的用户登录系统功能示例，看看吧!

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Python实现的用户登录系统功能示例，看看吧!

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