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。
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | #!/usr/bin/env pythondb 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">= {}def newuser(): prompt = 'login desired: ' while 1: name = raw_input(prompt) if db.has_key(name): prompt = 'name taken, try another: ' continue else: break pwd = raw_input('passwd: ') db[name] = pwddef olduser(): name = raw_input('login: ') pwd = raw_input('passwd: ') passwd = db.get(name) if passwd == pwd: pass else: print 'login incorrect' return print 'welcome back', namedef showmenu():##主函数名 prompt = """(N)ew User Login(E)xisting User Login(Q)uitEnter choice: """ done = 0 ##控制循环的控制器 while not done: chosen = 0 ##控制循环的控制器 while not chosen: try: choice = raw_input(prompt)[0] except (EOFError, KeyboardInterrupt): choice = 'q' print '
You picked: [%s]' % choice if choice not in 'neq':##非neq继续小循环 print 'invalid menu option, try again' else: chosen = 1 ##跳出小循环 if choice == 'q': done = 1 ##跳出大循环 if choice == 'n': newuser() if choice == 'e': olduser()if __name__ == '__main__': showmenu() |
运行结果：
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