class UserLoginForm(forms.Form):
    email = forms.EmailField()
    password = forms.CharField(label='Password',
                               widget=forms.PasswordInput)

    class Meta:
        # model = User
        fields = ('email', 'password')

<form method="post" action="">
    {% for error in errors %}
        <p>{{ error }}</p>
    {% endfor %}
    {% csrf_token %}
    <input type="text" name="email" placeholder="Email" />
    <input type="password" name="password" placeholder="Password" />
    <input type="submit" value="Login" />
</form>

def post(self, request, **kwargs):
    email = request.POST.get('email')
    password = request.POST.get('password')
    user = authenticate(email=email, password=password)
    if user is None:
        self.errors.append('Credentials are invalid')
    else:
        login(request, user)
    return super(LoginView, self).get(request, **kwargs)

class RegisterView(CreateView):
    template_name = 'users/register.html'
    form_class = UserCreationForm
    success_url = '/'