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Code Blocks
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.. code-block:: rst

    .. code-block:: python
        :emphasize-lines: 3,5
        :linenos:

        def some_function():
            interesting = False
            print 'This line is highlighted.'
            print 'This one is not...'
            print '...but this one is.'


.. code-block:: python
   :emphasize-lines: 3,5

   def some_function():
       interesting = False
       print 'This line is highlighted.'
       print 'This one is not...'
       print '...but this one is.'