db={}
def newuser():
    prompt='login desired:'
    while 1:
        name=raw_input(prompt)
        if db.has_key(name):
          prompt='name taken,try anoter:'
          continue
        else:
          break
        pwd=raw_input('password:')
        db[name]=pwd
def olduser():
    name=raw_input('login:')
    pwd=raw_input('password')
    passwd=db.get(name)
    if passwd==pwd:
        pass
    else:
        print'login incorrect'
        return
    print 'welcome back',name
def showmenu():
    prompt="""
    (N)ew User Login
    (E)xisiting User Login
    (Q)uit
enter ur choice:"""
    done=0
    while not done:
        chosen=0
        while not chosen:
            try:
                choice=raw_input(promopt)[0]
            except (eoferror,keyboardinterrupt):
                choice='q'
            print '\nu picked:[%s]'%choice
            if choice not in 'neq':
                print 'invalid option,try agian'
            else:
                    chosen=1
            if choice=='q':done=1
            if choice=='n':newuser()
            if choice=='e':olduser()
        if _name_=='_main_':
            showmenu()
  我在学习PYTHON。刚学到字典，这是一个书上的例子，通过一个虚拟的登陆数据库对用户名和密码进行管理，我把它编好了，存在C:\python24\login.py,我用的 XP操作系统，我在MSDOS下进到c:\python24输入login.py，为什么没什么反映，不是应该出现  N)ew User Login
    (E)xisiting User Login
    (Q)uit
吗？请高手指点，谢谢！！
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你的缩近有问题。


-- 
I like python!
UliPad <>: http://wiki.woodpecker.org.cn/moin/UliPad
My Blog: http://www.donews.net/limodou

你的代码有2个问题：
1. 缩进有问题，程序根本不会启动
2. 程序入口写错了，应该是if __name__ == '__main__': 前后各是两个下划线，你只用了一个。
正确的代码如下：
db={}

def newuser():
    prompt='login desired:'
    while 1:
        name=raw_input(prompt)
        if db.has_key(name):
            prompt='name taken,try anoter:'
            continue
        else:
            break
        pwd=raw_input('password:')
        db[name]=pwd

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

def showmenu():
    prompt="""
    (N)ew User Login
    (E)xisiting User Login
    (Q)uit
enter ur choice:"""
    done = 0
    while not done:
        chosen=0
        while not chosen:
            print 'start choosing'
            try:
                choice=raw_input(prompt)[0]
            except (eoferror,keyboardinterrupt):
                choice='q'
            print '\nu picked:[%s]'%choice
            if choice not in 'neq':
                print 'invalid option,try agian'
            else:
                chosen=1
            if choice=='q':done=1
            if choice=='n':newuser()
            if choice=='e':olduser()

if __name__ =='__main__':
    showmenu()

On 1/23/07, 田径 <jiehama2008在163.com> wrote:
>
>
>
>
> db={}
> def newuser():
>     prompt='login desired:'
>     while 1:
>         name=raw_input(prompt)
>         if db.has_key(name):
>           prompt='name taken,try anoter:'
>           continue
>         else:
>           break
>         pwd=raw_input('password:')
>         db[name]=pwd
> def olduser():
>     name=raw_input('login:')
>     pwd=raw_input('password')
>     passwd=db.get(name)
>     if passwd==pwd:
>         pass
>     else:
>         print'login incorrect'
>         return
>     print 'welcome back',name
> def showmenu():
>     prompt="""
>     (N)ew User Login
>     (E)xisiting User Login
>     (Q)uit
> enter ur choice:"""
>     done=0
>     while not done:
>         chosen=0
>         while not chosen:
>             try:
>                 choice=raw_input(promopt)[0]
>             except (eoferror,keyboardinterrupt):
>                 choice='q'
>             print '\nu picked:[%s]'%choice
>             if choice not in 'neq':
>                 print 'invalid option,try agian'
>             else:
>                     chosen=1
>             if choice=='q':done=1
>             if choice=='n':newuser()
>             if choice=='e':olduser()
>         if _name_=='_main_':
>             showmenu()
>
> 我在学习PYTHON。刚学到字典，这是一个书上的例子，通过一个虚拟的登陆数据库对用户名和密码进行管理，我把它编好了，存在C:\python24\login.py,我用的
> XP操作系统，我在MSDOS下进到c:\python24输入login.py，为什么没什么反映，不是应该出现
>   N)ew User Login
>     (E)xisiting User Login
>     (Q)uit
> 吗？请高手指点，谢谢！！
>
>
> ------------------------------
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-- 
Best Regards,

Archer

Ming Zhe Huang
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