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PYENV-VIRTUALENV.md

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Python virtual environments with pyenv-virtualenv

A quick and easy way of dealing with Python virtual environments to isolate dependencies between projects and even using different Python versions is using the combination of pyenv and virtualenv.

https://github.com/pyenv/pyenv-virtualenv

Mac installation of pyenv-virtualenv

  • Install pyenv and pyenv-virtualenv packages
brew install pyenv pyenv-virtualenv

Ubuntu installation of pyenv-virtualenv

  • Install pyenv with git
git clone https://github.com/pyenv/pyenv.git ~/.pyenv
  • Install pyenv-virtualenv as a pyenv plugin
git clone https://github.com/pyenv/pyenv-virtualenv.git ~/.pyenv/plugins/pyenv-virtualenv

Configure your shell to use pyenv-virtualenv

  • Add initializations to your shell "rc" file (.bashrc, .zshrc, ...)
export PYENV_ROOT="$HOME/.pyenv"
export PATH="$PYENV_ROOT/bin:$PATH
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"
export PYENV_VIRTUALENV_DISABLE_PROMPT=0

Create a virtual environment

  • Install desired Python version
pyenv install <python_version>
  • Create a virtual env for the project
pyenv virtualenv <python_version> <project_name>

Use the virtual environment

  • Activate the virtual env
pyenv activate <project_name>
  • Deactivate the virtual env
pyenv deactivate

To activate the virtual env automatically on entering the project directory, create a .python-version file containing the name of a valid virtual environment as shown in the output of pyenv virtualenvs.