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()
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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