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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#!/usr/bin/env python db = {} 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] = pwd def 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' , name def showmenu(): ##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 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 '\nYou 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:
希望本文所述对大家Python程序设计有所帮助。
原文链接:http://www.cnblogs.com/paulwinflo/p/4936983.html