Awesomely easy virtualenvs on OSX using pyenv and direnv

pyenv+direnv on OSX.md

Awesomely easy virtualenvs on OSX using pyenv and direnv

Never forget to activate that virtualenv or set that environment variable ever again...

Install

1. Install pyenv

    brew install pyenv
   

2. Install a few different pythons

   pyenv install 3.6.0
   pyenv install 3.5.2
   pyenv install 2.7.who-cares
   

3. Install direnv

   brew install direnv
   

4. If you're using zsh add the following to your ~/.zshrc:

   echo 'eval "$(direnv hook zsh)"' >> ~/.zshrc
   

5. If you're using bassh add the following to your ~/.bashrc:

   echo 'eval "$(direnv hook bash)"' >> ~/.bashrc
   

6. Copy .direnvrc into ~/

You now have everything setup to use direnv.

In use

Now, time to actually use it.

1. Create a directory, I usually put this in ~/workspace, others prefer !/projects.

   mkdir ~/projects/w00t
   

2. Create the file ~/projects/w00t/.envrc

   echo "use python 3.6.0" > ~/projects/w00t/.envrc
   echo "export AN_ENVIRONMENT_VARIABLE=1" >> ~/projects/w00t/.envrc
   

3. Go into that directory and say "yes, I trust this .envrc". You only need to do this when your .envrc file changes.

   cd ~/projects/w00t
   direnv allow
   

   This will cause a new python virtualenv to be created in ~/projects/w00t/.direnv

Now anytime you cd into ~/projects/w00t or a directory below that the virtualenv will automatically be enabled for you and environment variable AN_ENVIRONMENT_VARIABLE will be set.

w00t!

.direnvrc

# See https://github.com/direnv/direnv/wiki/Python#-pyenv

use_python() {
  local python_root=$HOME/.pyenv/versions/$1
  load_prefix "$python_root"
  layout_python "$python_root/bin/python"
}