Pyenv

• Installing a new Python version

  pyenv install [PYTHON_VERSION]
  

• Set up a new pyenv virtualenv with

  pyenv virtualenv [PYTHON_VERSION] [ARBITRARY_VIRTUALENV_NAME]
  

• A neat feature to register your current pyenv virtualenv as the default one to use when you navigate to that directory

In the root of the project, execute

pyenv local [NAME_OF_VIRTUALENV]

This will create a .python-version file in the current directory, and thereafter the correct pyenv virtualenv will be autoselected.