#django/urls.py
urlpatterns = patterns('',
    url(r'myapp/', include('myapp.urls')),
    url(r'^admin/', include(admin.site.urls)),
)

#myapp/urls.py
urlpatterns = patterns('myapp.views',
    url(r'^$', 'index', name='index'),
    url(r'register/$', 'register', name='register'),
    url(r'myaccount/$', 'myaccount', name='myaccount'),
    url(r'login/$', 'login_page', name='login'),
    url(r'logout/$', 'logout_user', name='logout')
)

#myapp/login.py
def login_page(request):
    if request.user.is_authenticated():
        return HttpResponseRedirect(reverse('index'))
    form = LoginForm(request.POST or None)
    if form.is_valid():
        username = form.cleaned_data['username']
        username = username.capitalize()
        password = form.cleaned_data['password']
        try:
            User.objects.get(username=username)
        except:
            return render(request, 'myapp/login.html', {
                'form': form,
                'error': "Account doesn't exist"
                })
        user = authenticate(username=username, password=password)
        if user is not None:
            if user.is_active:
                login(request, user)
                return HttpResponseRedirect(reverse('index'))
            else:
                return render(request, 'myapp/login.html', {
                    'form': form,
                    'error': 'Account is disabled or banned',
                    })
        else:
            return render(request, 'myapp/login.html', {
                'form': form,
                'form': 'Authentication Error!'
                })
    return render(request, 'myapp/login.html', {
        'form': form,
        })

{% if not user.is_authenticated %}

#myapp/templates/myapp/login.html
<strong>Login</strong>
<form action='{% url 'login' %}' method="post">{% csrf_token %}
{{ form.as_p }}
<input type="submit" value="Login">
</form>
{{ error }}
{% endif %}