Updated doc links to point to Python 3 documentation

# The name of the Pygments (syntax highlighting) style to use.

pygments_style = 'trac'

# Links to Python's docs should reference the most recent version of the 2.x

# Links to Python's docs should reference the most recent version of the 3.x

# branch, which is located at this URL.

intersphinx_mapping = {

    'python': ('http://docs.python.org/', None),

    'python': ('http://docs.python.org/3/', None),

    'sphinx': ('http://sphinx-doc.org/', None),

    'six': ('http://pythonhosted.org/six/', None),

    'simplejson': ('http://simplejson.readthedocs.org/en/latest/', None),

    >>> import django

    >>> django.setup()

    If this raises an :exc:`~exceptions.AttributeError`, you're probably using

    If this raises an :exc:`AttributeError`, you're probably using

    a version of Django that doesn't match this tutorial version. You'll want

    to either switch to the older tutorial or the newer Django version.

  <django.http.HttpRequest.POST>` in our code, to ensure that data is only

  altered via a POST call.

* ``request.POST['choice']`` will raise :exc:`~exceptions.KeyError` if

* ``request.POST['choice']`` will raise :exc:`KeyError` if

  ``choice`` wasn't provided in POST data. The above code checks for

  :exc:`~exceptions.KeyError` and redisplays the question form with an error

  :exc:`KeyError` and redisplays the question form with an error

  message if ``choice`` isn't given.

* After incrementing the choice count, the code returns an

.. method:: AppConfig.get_model(model_name)

    Returns the :class:`~django.db.models.Model` with the given

    ``model_name``. Raises :exc:`~exceptions.LookupError` if no such model

    exists. ``model_name`` is case-insensitive.

    ``model_name``. Raises :exc:`LookupError` if no such model exists.

    ``model_name`` is case-insensitive.

.. method:: AppConfig.ready()

.. method:: apps.get_app_config(app_label)

    Returns an :class:`~django.apps.AppConfig` for the application with the

    given ``app_label``. Raises :exc:`~exceptions.LookupError` if no such

    application exists.

    given ``app_label``. Raises :exc:`LookupError` if no such application

    exists.

.. method:: apps.is_installed(app_name)

    argument in the form ``app_label.model_name``. ``model_name`` is case-

    insensitive.

    Raises :exc:`~exceptions.LookupError` if no such application or model

    exists. Raises :exc:`~exceptions.ValueError` when called with a single

    argument that doesn't contain exactly one dot.

    Raises :exc:`LookupError` if no such application or model exists. Raises

    :exc:`ValueError` when called with a single argument that doesn't contain

    exactly one dot.

.. _applications-troubleshooting:

    * :meth:`~django.contrib.auth.models.User.set_password()`,

      :meth:`~django.contrib.auth.models.User.check_password()`,

      :meth:`~django.db.models.Model.save` and

      :meth:`~django.db.models.Model.delete()` raise

      :exc:`~exceptions.NotImplementedError`.

      :meth:`~django.db.models.Model.delete()` raise :exc:`NotImplementedError`.

In practice, you probably won't need to use

:class:`~django.contrib.auth.models.AnonymousUser` objects on your own, but