Happy coding – and may your Python versions always be compatible.
The .python-version file is a widespread, elegant solution to this version-drift problem. This single-line text file acts as an automated configuration anchor, allowing tools to switch environments invisibly as you navigate through your terminal. What is a .python-version File?
asdf local python 3.13.13
Python 2.x versions are no longer officially supported, but they still have a significant presence in the industry. If you're working with legacy code, you may need to use an older Python version. However, it's recommended to migrate your code to a modern Python version to take advantage of the latest features, security updates, and support. .python version
add it to .gitignore . This file ensures that every clone, branch, and CI run uses the same Python version.
Notes:
pyenv has three scopes:
As of Python 3.9 and later, the number of keywords has grown to 36 or more. These additions often support improvements in asynchronous programming ( async , await ) and structure ( match , case in newer versions). Categorizing Python Keywords
async , await (handling concurrent code). How to Check Keywords in Your Specific Python Version
This tells package installers like pip which Python versions are compatible. Happy coding – and may your Python versions
that allows disabling the Global Interpreter Lock (GIL), potentially revolutionizing multi-core performance [33]. Python 3.11
The most prominent user of this file pattern is Pyenv . Pyenv inserts shims into your system path to intercept Python commands. When you call python inside a directory, Pyenv checks the current directory (and parent directories) for a .python-version file. If found, it routes the execution to the specified installation version.
conda has its own environment system and ignores .python-version . To use both, either: What is a
# Pin a Python version for the project uv python pin 3.13