upgrading_to_python3.6.txt

https://docs.python.org/3/howto/pyporting.html

https://docs.python.org/3/whatsnew/index.html

https://stackoverflow.com/questions/43957004/upgrade-python-3-4-3-to-python-3-6-1-in-ubuntu-15-0464-bit

https://docs.python.org/3/library/venv.html

https://stackoverflow.com/questions/6587507/how-to-install-pip-with-python-3

https://python-future.org/compatible_idioms.html

https://python-future.org/automatic_conversion.html

http://python3porting.com/