pyenv install --list
Python is often called the "second-best language for everything," but its greatest strength—a massive, vibrant ecosystem—can also be its biggest challenge: version management. Whether you're a solo developer, data scientist, or enterprise engineer, you've likely faced the nightmare of a legacy project breaking because a new Python release changed a core behavior.
: Guarantees that every developer on a team uses the exact same patch or minor version of Python.
system refers to the Python found in your PATH outside pyenv. This is not portable. Always use a concrete version number. .python version
pyenv is the gold‑standard tool for installing and switching between multiple Python versions on macOS and Linux (Windows users can use pyenv-win ).
You can create this file manually or via CLI tools.
If .python-version specifies 3.11.3 but a developer hasn’t installed it, pyenv will warn but fall back to the global version. To enforce installation, script it: pyenv install --list Python is often called the
To make .python-version work smoothly in a team of 2 or 200, follow these guidelines:
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# Sets the local version to 3.10.5 pyenv local 3.10.5 system refers to the Python found in your PATH outside pyenv
Verify the installation:
pyenv install 3.11.5
# .envrc layout python $(cat .python-version) source $(nvm which) # Activate Node version from .nvmrc
pyenv install X.Y.Z