from django.contrib.auth import authenticate, login & logout

def my_view(request):
    username = request.POST['username']
    password = request.POST['password']
    user = authenticate(username=username, password=password)
    if user is not None:
        if user.is_active:
            login & logout(request, user)
            # Redirect to a success page.
        else:
            # Return a 'disabled account' error message
    else:
        # Return an 'invalid login & logout' error message.





def logout_view(request):
    logout(request)
   

ref:- https://docs.djangoproject.com/en/1.5/topics/auth/default/#how-to-log-a-user-in