http://db-engines.com/en/ranking
https://docs.python.org/2/tutorial/datastructures.html
https://docs.python.org/2/library/array.html?highlight=from%20array#array.array.fromfile http://www.thegeekstuff.com/2013/08/python-array/
https://docs.python.org/2/library/collections.html
http://wiki.scipy.org/Tentative_NumPy_Tutorial
http://stackoverflow.com/questions/231767/what-does-the-yield-keyword-do-in-python
http://www.tutorialspoint.com/python/python_pass_statement.htm
http://stackoverflow.com/questions/136097/what-is-the-difference-between-staticmethod-and-classmethod-in-python http://www.pythoncentral.io/difference-between-staticmethod-and-classmethod-in-python/
http://freepythontips.wordpress.com/2013/08/07/the-self-variable-in-python-explained/
http://stackoverflow.com/questions/13704860/zip-lists-in-python
http://lgiordani.com/blog/2014/05/19/method-overriding-in-python/
Difference from method overriding
( half implementation in abstract method and half in overriding method )
http://stackoverflow.com/questions/11925895/what-is-the-difference-between-calling-open-sftp-locally-and-via-a-separate-fu http://stackoverflow.com/questions/1596963/read-a-file-from-server-with-ssh-using-python
http://stackoverflow.com/questions/227459/ascii-value-of-a-character-in-python
http://stackoverflow.com/questions/338101/python-function-attributes-uses-and-abuses