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来源：互联网发布：求生之路4mac 编辑：程序博客网时间：2024/05/19 04:04

代码：

#!/usr/bin/env python

db = {}

#newuser process
def newuser():
    prompt = 'login desired: '
    while True:
        name = raw_input(prompt)
        if db.has_key(name):
            prompt = 'name taken, try another: '
            continue
        else:
            break
    pwd = raw_input('passwd: ')
    db[name] = pwd

#olduser process
def olduser():
    name = raw_input('login: ')
    pwd = raw_input('passwd: ')
    passwd = db.get(name)
    if passwd == pwd:
        print 'welcome back', name
    else:
        print 'login incorrect'

def showmenu():
    prompt = """
(N)ew User Longin
(E)xisting User Login
(Q)uit

Enter choice: """
    done = False
    while not done:

        chosen = False
        while not chosen:
            try:
                choice = raw_input(prompt).strip()[0].lower()
            except (EOFError, KeyboardInterrupt):
                choice = 'q'
            print '\nYou picked: [%s]' % choice
            if choice not in 'neq':
                print 'invalid option, try again'
            else:
                chosen = True
        if choice =='q':done = True
        if choice =='n':newuser()
        if choice =='e':olduser()

if __name__ == '__main__':
    showmenu()

运行结果：

>>> ================================ RESTART ================================
>>>

(N)ew User Longin
(E)xisting User Login
(Q)uit

Enter choice: e

You picked: [e]
login: hailonxi
passwd: initial
login incorrect

(N)ew User Longin
(E)xisting User Login
(Q)uit

Enter choice: n

You picked: [n]
login desired: hailonxi
passwd: initial

(N)ew User Longin
(E)xisting User Login
(Q)uit

Enter choice: e

You picked: [e]
login: hailonxi
passwd: initial
welcome back hailonxi

(N)ew User Longin
(E)xisting User Login
(Q)uit

Enter choice: n

You picked: [n]
login desired: hailonxi
name taken, try another:
passwd:

(N)ew User Longin
(E)xisting User Login
(Q)uit

Enter choice: q

You picked: [q]
>>>

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