Untitled

def login(request):

    if request.user.is_authenticated():
        return HttpResponseRedirect('/index/')

    username = request.POST.get('username', '')
    password = request.POST.get('password', '')

    user = auth.authenticate(username=username, password=password)

    if user is None and user.is_active:
        auth.login(request, user)
        return HttpResponseRedirect('/index/')
    else:
        return render_to_response('login.html', RequestContext(request, locals()))

<!doctype html>
<body>
    <form action="" method="post">
        <label for="username">用戶名稱:</label>{% csrf_token %}
        <input type="text" name="username" value="{{username}}" id="username"><br />
        <label for="password">用戶密碼:</label>
        <input type="password" name="password" value="" id="password"><br />
        <input type="submit" value="登入" />
    </form>
</body>