.python Version Jun 2026

While it looks like a native Python configuration asset, the Python interpreter itself does not natively parse .python-version . Instead, it is utilized by a robust ecosystem of third-party workflow managers.

Isolating third-party packages, libraries, and binary distributions.

Once you have the right Python version, pair it with ( venv or uv venv ). Never install packages globally.

Demystifying .python-version : The Complete Guide to Managing Local Python Environments .python version

This creates .python-version in the current directory.

FROM python:3.13-slim WORKDIR /app COPY requirements.txt . RUN pip install -r requirements.txt COPY . . CMD ["python", "app.py"]

Python has evolved from a niche scripting tool created in the late 1980s into the world's most popular programming language as of 2026 [9, 10]. The language follows a strict annual release cycle While it looks like a native Python configuration

To declare a local version for your repository using Pyenv, run the following command in your project's root folder: pyenv local 3.12.1 Use code with caution.

source .venv-313/bin/activate

Before diving into management tools, let’s review the simplest ways to check which Python version is currently active. Once you have the right Python version, pair

You can create this file manually or through a version manager's command line interface. 1. Using pyenv

name: myproject dependencies: - python=3.11 - pip

If your terminal continues to execute a globally configured system Python version instead of the version inside .python-version , check your shell startup script ( .bashrc or .zshrc ). Ensure that your environment manager's initialization hooks are properly evaluated and placed at the very top of your system $PATH .