Pyenv

External

• https://github.com/pyenv/pyenv

Internal

• Python Package Managers

Overview

pyenv is a tool that let you switch between multiple version of Python.

pyenv lets you change the global Python version on a per-user basis. It also provides support for per-project Python versions. It allows you to override the Python version with an environment variables.

pyenv works by intercepting Python commands using shim executables injected in PATH, determines which Python version has been specified by your application and passes the command along to the correct Python installation.

Version Selection

The intercepting pyenv shim determines what Python version is needed by looking at the following sources, in this order:

1. PYENV_VERSION
2. The application-specific .python-version in the current directory.
3. The first .python-version file found by searching each parent directory up to the filesystem root.
4. The global $(pyenv root)/version file.