References

http://book.pythontips.com/en/latest/index.html

http://python-3-patterns-idioms-test.readthedocs.io/en/latest/PythonForProgrammers.html

https://github.com/arogozhnikov/python3_with_pleasure

http://docs.python-guide.org/en/latest/writing/gotchas

http://pythonextensionpatterns.readthedocs.io/en/latest/refcount.html