def logar(request, template_name='Login/login.html'):
if request.method == "POST":
    username = request.POST['username']
    password = request.POST['password']
    user = authenticate(username=username, password=password)
    if user is not None:
        if user.is_active:
            login(request, user)
            messages.success(request, 'Logado com sucesso!')
            return redirect('listar_cliente')
    else:
        messages.error(request, 'Usuário ou senha incorretos!')
        return HttpResponseRedirect(settings.LOGIN_URL)
return render(request, template_name, {})