.python Version -

uv is a Rust‑based, all‑in‑one tool that handles Python version installation, virtual environments, and dependency management – similar to poetry but with added version management and blistering speed.

(e.g., 3.11 instead of 3.11.5 ) to automatically receive bugfix updates. But for extreme reproducibility (e.g., embedded systems), pin to the full 3.11.5 .

Managing multiple Python environments can quickly become chaotic. One project might require the cutting-edge features of Python 3.13, while a legacy enterprise application remains chained to Python 3.9. .python version

Modern Integrated Development Environments—including VS Code (via the Python extension) and PyCharm—actively scan project roots for this file. They will automatically suggest or select the matching local interpreter for your workspace. How to Create and Use a .python-version File

3.10

Multi-language version managers like asdf or mise can be configured to read .python-version files alongside their standard .tool-versions files, making them excellent for polyglot repositories. Best Practices

In the world of Python development, .python-version is a simple text file used by version managers like uv is a Rust‑based, all‑in‑one tool that handles

You can create this file manually or via your version manager's command line:

# Pin a Python version for the project uv python pin 3.13 They will automatically suggest or select the matching

Python has undergone major transitions: from Python 2 to Python 3, from 3.5 to 3.6 (with f-strings), 3.7 (data classes), 3.8 (walrus operator), 3.9 (new parser), 3.10 (pattern matching), 3.11 (faster CPython), 3.12 (better error messages), and beyond. Each release introduces , deprecations, and new syntax.