.python Version -

: Match the version in this file to the version used in your production environment (e.g., your Dockerfile or AWS Lambda runtime) to ensure consistent behavior across all stages of development. Common Alternatives

: The file contains a single string of text, such as 3.11.4 .

To use this file effectively, you should first install a version manager. .python version

: Follow the installation guide on the pyenv GitHub repository.

: Navigate to your project folder and run pyenv local 3.12.0 . This automatically generates the .python-version file for you. Best Practices for Teams : Match the version in this file to

: If a directory doesn't have the file, the tool searches "up" the folder tree until it finds one or falls back to a global default. Setting Up Your Environment

: If the file exists, the manager immediately sets the local environment to the version specified inside. : Follow the installation guide on the pyenv

: Uses environment.yml files to define entire environments, including Python versions and dependencies.