Implemented login function.

login.html

{% extends "base.html" %}
{% block title_html %}
User login form
{% endblock %}
{% block article_content %}
    {% if user.is_authenticated %}
    	<!-- Authenticated. -->
        <h1>You are connected.</h1>
        <p>Your email : {{ user.email }}</p>
        <p><a href="/">Return to home</a></p>
    {% else %}
    	<!-- Not authenticated -->
        <h1>User login form</h1>
        <form method="post" action="{{ user_login }}">
        {% csrf_token %}
        <table>
            {{ form.as_table }}
        </table>
        <input type="submit" class="button" value="Login" />
        </form>
    {% endif %}
{% endblock %}

login.py

# -*- Coding: utf-8 -*-
from django.shortcuts import render, redirect
from django import forms
from django.contrib.auth import authenticate, login

def page(request):
    
    if request.POST:
        form = Login_form(request.POST)
        if form.is_valid():
            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)
                    if request.GET.get('next') is not None:
                        # Redirect to a success page.
                        return redirect(request.GET['next'])
    
    # New form when not the request is get.
    else:
        form = Login_form()
    return render(request, 'jp/login.html', {'form' : form})

class Login_form(forms.Form):
    username = forms.CharField(label="User name")
    password = forms.CharField(label="Password", widget=forms.PasswordInput)
    def clean(self):
        cleaned_data = super(Login_form, self).clean()
        username = self.cleaned_data.get('username')
        password = self.cleaned_data.get('password')
        if not authenticate(username=username, password=password):
            raise forms.ValidationError("Wrong user name or passwsord")
        return self.cleaned_data

settings.py

# Authentification
LOGIN_URL = 'user_login'

urls.py

from django.contrib.auth.decorators import login_required
from django.views.generic import TemplateView

urlpatterns = patterns('',
    url(r'^login/$','myapp.views.login.page', name="user_login"),
    url(r'^$', login_required(TemplateView.as_view(template_name='jp/index.html')), name="index"),
    #url(r'^$', 'myapp.views.index.page', name="index"),
    url(r'^admin/', include(admin.site.urls)),
)