Setup direnv + pyenv + pyenv-virtualenv

.direnvrc

# use a certain pyenv version
use_python() {
    if [ -n "$(which pyenv)" ]; then
        local pyversion=$1
        pyenv local ${pyversion}
    fi
}

layout_virtualenv() {
    local pyversion=$1
    local pvenv=$2
    if [ -n "$(which pyenv-virtualenv)" ]; then
        pyenv virtualenv --force --quiet ${pyversion} ${pvenv}-${pyversion}
    fi
    pyenv local --unset
}

layout_activate() {
    if [ -n "$(which pyenv)" ]; then
        source $PYENV_ROOT/versions/$1/bin/activate
    fi
}

direnv+pyenv+pyenv-virtualenv.md

Install and setup

1. Install pyenv and pyenv-virtualenv

    brew install pyenv
    brew install pyenv-virtualenv
   

2. Install different versions of python

   pyenv install 3.6.4
   pyenv install 3.6.0
   

3. Install direnv

   brew install direnv
   

4. Update ~/.zshrc

   echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.zshrc
   echo 'eval "$(pyenv init -)"' >> ~/.zshrc
   echo 'eval "$(pyenv virtualenv-init -)"' >> ~/.zshrc
   echo 'eval "$(direnv hook zsh)"' >> ~/.zshrc
   

5. Restart shell

6. Add .direnvrc under ~/

In use

1. Create a project directory.

   mkdir project_1
   

2. Create virtual environment:

   pyenv virtualenv 3.6.7 venv-name
   

3. Create .python-version under ./project_1 with the virtual environment name created in step 2.

   venv-name
   

4. Create .envrc under ./project_1 with environment variables declaration like: export ENV_VARIBALE_NAME=bla

5. Enter the project directory, run this command to trust current environment, you only need to run this at this first time and once .envrc is updated.

   cd projects_1/
   direnv allow
   

Now anytime you enter ./project_1/ or a directory under it, the virtualenv will automatically be activated, and environment variables will be setup.

6. For IDE virtualenv setup, the created virtualenv is under directory ~/.pyenv/versions/virtualenv_name/