如果用户名和密码正确，但是is_active字段为false，但没有显示此代码的消息，则尝试显示一些消息。它向我显示else即使该无效用户的用户名和密码正确，也可以分开。该怎么办？

我认为将is_active字段设置为false后，会将User设置为None

views.py

form = LoginForm()
    if request.method == 'POST':
        form = LoginForm(request.POST)
        if form.is_valid():
            username = form.cleaned_data['username']
            password = form.cleaned_data['password']
            remember_me = form.cleaned_data['remember_me']
            user = authenticate(request,username=username,password=password)

            if user and not user.is_active:
                messages.info(request,'Sorry your account is deactivated now.')
                return redirect('/login/')

            elif user and user.is_active:
                login(request,user)
                if not remember_me:
                    request.session.set_expiry(0)
                else:
                    request.session.set_expiry(settings.SESSION_COOKIE_AGE)
             else:
                 messages.error(request,'Invalid login credentials. Try Again.')
                 return redirect('/login/')