improved default python vars

[iloveitaly]

Reopened this PR with requested documentation.

These look good, but just wondering where these came from

These are generally recommended variables for production. I've curated them over the last year from various python docker files I've worked with. They are all documented here:

https://docs.python.org/3/using/cmdline.html

[iloveitaly]

@coffee-cup awesome! Sounds great.

[coffee-cup]

I've pushed 2 commits to fix the tests and linting