Fixed #26483 -- Updated docs.python.org links to use Intersphinx.

docs/intro/contributing.txt

@@ -373,10 +373,9 @@ that passing a ``prefix`` parameter when creating an instance still works too.
     * Dive Into Python (a free online book for beginning Python developers)
       includes a great `introduction to Unit Testing`__.
     * After reading those, if you want something a little meatier to sink
-      your teeth into, there's always the `Python unittest documentation`__.
+      your teeth into, there's always the Python :mod:`unittest` documentation.
 
 __ http://www.diveintopython.net/unit_testing/index.html
-__ https://docs.python.org/library/unittest.html
 
 Running your new test
 ---------------------

docs/intro/overview.txt

@@ -201,15 +201,13 @@ example above:
         url(r'^articles/([0-9]{4})/([0-9]{2})/([0-9]+)/$', views.article_detail),
     ]
 
-The code above maps URLs, as simple `regular expressions`_, to the location of
-Python callback functions ("views"). The regular expressions use parenthesis to
-"capture" values from the URLs. When a user requests a page, Django runs
-through each pattern, in order, and stops at the first one that matches the
-requested URL. (If none of them matches, Django calls a special-case 404 view.)
-This is blazingly fast, because the regular expressions are compiled at load
-time.
-
-.. _regular expressions: https://docs.python.org/howto/regex.html
+The code above maps URLs, as simple :ref:`regular expressions <regex-howto>`,
+to the location of Python callback functions ("views"). The regular expressions
+use parenthesis to "capture" values from the URLs. When a user requests a page,
+Django runs through each pattern, in order, and stops at the first one that
+matches the requested URL. (If none of them matches, Django calls a
+special-case 404 view.) This is blazingly fast, because the regular expressions
+are compiled at load time.
 
 Once one of the regexes matches, Django imports and calls the given view, which
 is a simple Python function. Each view gets passed a request object --

docs/intro/reusable-apps.txt

@@ -34,9 +34,9 @@ projects and ready to publish for others to install and use.
 
 .. admonition:: Package? App?
 
-    A Python `package <https://docs.python.org/tutorial/modules.html#packages>`_
-    provides a way of grouping related Python code for easy reuse. A package
-    contains one or more files of Python code (also known as "modules").
+    A Python :term:`package` provides a way of grouping related Python code for
+    easy reuse. A package contains one or more files of Python code (also known
+    as "modules").
 
     A package can be imported with ``import foo.bar`` or ``from foo import
     bar``. For a directory (like ``polls``) to form a package, it must contain

docs/intro/tutorial01.txt

@@ -102,8 +102,8 @@ These files are:
   anything inside it (e.g. ``mysite.urls``).
 
 * :file:`mysite/__init__.py`: An empty file that tells Python that this
-  directory should be considered a Python package. (Read `more about
-  packages`_ in the official Python docs if you're a Python beginner.)
+  directory should be considered a Python package. If you're a Python beginner,
+  read :ref:`more about packages <tut-packages>` in the official Python docs.
 
 * :file:`mysite/settings.py`: Settings/configuration for this Django
   project.  :doc:`/topics/settings` will tell you all about how settings
@@ -116,8 +116,6 @@ These files are:
 * :file:`mysite/wsgi.py`: An entry-point for WSGI-compatible web servers to
   serve your project. See :doc:`/howto/deployment/wsgi/index` for more details.
 
-.. _more about packages: https://docs.python.org/tutorial/modules.html#packages
-
 The development server
 ======================
 
@@ -211,9 +209,10 @@ rather than creating directories.
     configuration and apps for a particular website. A project can contain
     multiple apps. An app can be in multiple projects.
 
-Your apps can live anywhere on your `Python path`_. In this tutorial, we'll
-create our poll app right next to your :file:`manage.py` file so that it can be
-imported as its own top-level module, rather than a submodule of ``mysite``.
+Your apps can live anywhere on your :ref:`Python path <tut-searchpath>`. In
+this tutorial, we'll create our poll app right next to your :file:`manage.py`
+file so that it can be imported as its own top-level module, rather than a
+submodule of ``mysite``.
 
 To create your app, make sure you're in the same directory as :file:`manage.py`
 and type this command:
@@ -236,8 +235,6 @@ That'll create a directory :file:`polls`, which is laid out like this::
 
 This directory structure will house the poll application.
 
-.. _`Python path`: https://docs.python.org/tutorial/modules.html#the-module-search-path
-
 Write your first view
 =====================