References
Reference NO 1
http://stackoverflow.com/questions/16805664/force-one-of-two-python-class-attributes-to-be-always-be-assigned-a-value
Reference NO 2
http://www.lib.uchicago.edu/keith/courses/python/class/5/
Reference NO 3
http://docs.python.org/tutorial/classes.html
Reference NO 4
http://docs.python.org/reference/datamodel.html
Reference NO 5
http://www.tutorialspoint.com/python/python_classes_objects.htm
Reference NO 6
http://en.wikibooks.org/wiki/Python_Programming/Classes
Reference NO 7
https://www.inkling.com/read/learning-python-mark-lutz-4th/chapter-28/namespaces-the-whole-story
Reference NO 8
#EANF#
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