Object Oriented Python by Example
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Let's take a second pass at object oriented programming in Python.

Object oriented programming is about creating new types to model data used
in the program.


Python Person (person.py)
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.. literalinclude:: /code/person.py


Extending Person
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In object oriented programming in inheritance defines an "is a" relationship
between types.

To continue the example we could say a student is a person. This would create 
a Student class which is a sub-class of Person. Students have things that
normal people don't have like a GPA.


Using ``super``
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Extending the class allows us to extend or override the functionally given by the base.
If we don't override a name in the new class accessing that name will use functionality
defined in the base. If we do override a name it we can still access the base class
definition using ``super``.


Extending Person (student.py)
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.. literalinclude:: /code/student.py


.. header:: 

   MA792K Spring 2011 Lecture 3 (Again)

.. footer:: 

   © Mark Lavin 2011