class User(models.Model):
    username = models.CharField(maxlength=30)
    password = models.CharField(maxlength=300)
    mail = models.EmailField()
    datereg = models.DateField()
    # Avatar

    def __str__(self):
        return "%s %s %s %s" % (self.username, self.password, self.mail, self.datereg)

    class Admin:
        list_display = ('username', 'password', 'mail', 'datereg')

class Login(newforms.Form):
    username = newforms.CharField(label=u'Имя')
    password = newforms.CharField(label=u'Пароль', max_length=30)

def Index(request):
    if request.method == 'POST':
        form = Login(request.POST)

        if form.is_valid():
            usr = form.clean_data['username']
            pwd = form.clean_data['password']
            userbd = User.objects.filter(username=usr, password=pwd)

            if userbd is not None:
                user = auth.authenticate(username=usr, password=pwd)

                if user is not None and user.is_active:
                    auth.login(request, user)
                    return HttpResponseRedirect('/%s/' % (usr))
            else:
                # пользователь не существует
                pass
    else:
        form = Login()
    return render_to_response('index.html', locals())