How can I install multiple versions of Python on latest OS X and use them in parallel?

Question

I want to run tests with multiple Python versions on OS X 10.11, including:

• Python 2.6 - ?!
• Python 2.7 - default - solved
• Python 3.4 - ?!

Answer 1

pyenv is all well and good but I feel that we should give a mention to the wonderful pipenv library from Kenneth Reitz.

https://github.com/pypa/pipenv

It provides the functionality of pyenv plus dependency locking, support for .env out-of-the-box and much more.