Use Multiple Python Versions with pyenv

pyenv is a tool that lets you install and switch between multiple Python versions on Mac and Linux. Here's how to install and use pyenv:

Installing pyenv

On macOS, install pyenv using Homebrew:

brew install pyenv

On Linux, use the automated installer:

curl https://pyenv.run | bash

Basic pyenv Commands

List available Python versions:

pyenv install --list

Install a specific Python version:

pyenv install 3.9.0
pyenv install 2.7.18

Set global Python version:

pyenv global 3.9.0

Set local Python version for current directory:

pyenv local 2.7.18

Using Multiple Versions

Set multiple versions globally:

pyenv global 3.9.0 2.7.18

Check current Python version:

pyenv version

List installed versions:

pyenv versions

Virtual Environments

Create a virtual environment with specific Python version:

pyenv virtualenv 3.9.0 myproject
pyenv local myproject

pyenv works well with virtual environments and package managers, and allows you to easily work with multiple Python projects with different version requirements.

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