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+.. _qtut_logging:
+
+============================================
+16: Collecting Application Info With Logging
+============================================
+
+Capture debugging and error output from your web applications using
+standard Python logging.
+
+Background
+==========
+
+It's important to know what is going on inside our web application.
+In development we might need to collect some output. In production,
+we might need to detect problems when other people use the site. We
+need *logging*.
+
+Fortunately Pyramid uses the normal Python approach to logging. The
+scaffold generated, in your ``development.ini``, a number of lines that
+configure the logging for you to some reasonable defaults. You then see
+messages sent by Pyramid (for example, when a new request comes in.)
+
+Objectives
+==========
+
+- Inspect the configuration setup used for logging
+
+- Add logging statements to your view code
+
+Steps
+=====
+
+#. First we copy the results of the ``view_classes`` step:
+
+   .. code-block:: bash
+
+    $ cd ..; cp -r view_classes logging; cd logging
+    $ $VENV/bin/python setup.py develop
+
+#. Extend ``logging/tutorial/views.py`` to log a message:
+
+   .. literalinclude:: logging/tutorial/views.py
+    :linenos:
+
+#. Make sure the tests still pass:
+
+   .. code-block:: bash
+
+    $ $VENV/bin/nosetests tutorial
+
+#. Run your Pyramid application with:
+
+   .. code-block:: bash
+
+    $ $VENV/bin/pserve development.ini --reload
+
+#. Open http://localhost:6543/ and http://localhost:6543/howdy
+   in your browser. Note, both in the console and in the debug
+   toolbar, the message that you logged.
+
+Analysis
+========
+
+Our ``development.ini`` configuration file wires up Python standard
+logging for our Pyramid application:
+
+.. literalinclude:: logging/development.ini
+    :language: ini
+
+In this, our ``tutorial`` Python package is setup as a logger
+and configured to log messages at a ``DEBUG`` or higher level. When you
+visit http://localhost:6543 your console will now show::
+
+ 2013-08-09 10:42:42,968 DEBUG [tutorial.views][MainThread] In home view
+
+Also, if you have configured your Pyramid application to use the
+``pyramid_debugtoolbar``, logging statements appear in one of its menus.
+
+.. seealso:: See Also: :ref:`logging_chapter`