How to Find Your Python Version (All Methods Explained)

Knowing which version of Python you're running isn't just a housekeeping detail — it directly affects which libraries you can install, whether your code will run, and how you troubleshoot errors. Python 2 and Python 3 behave differently enough that version mismatches cause real problems, and even within Python 3, minor version differences matter for certain features and packages.

Why Your Python Version Matters

Python has gone through significant changes over the years. Python 2 reached end-of-life in January 2020, meaning it no longer receives security updates. Python 3 is now the standard, but it's not a single fixed target — Python 3.8, 3.10, and 3.12 each introduced features, deprecated old ones, and changed how certain things behave under the hood.

When you install a library like NumPy, TensorFlow, or Django, the package maintainers specify which Python versions they support. Installing a package incompatible with your Python version is one of the most common sources of "it won't install" errors. Knowing your exact version — including the major, minor, and patch numbers — is step one in diagnosing those issues.

How to Check Your Python Version from the Command Line 💻

This is the fastest and most reliable method on any operating system.

On Windows (Command Prompt or PowerShell):

or

On macOS or Linux (Terminal):

The output looks like: Python 3.11.4

That string breaks down as:

• 3 = major version
• 11 = minor version
• 4 = patch/micro version

Checking Which Python a Script Is Actually Using

Running python --version tells you what the terminal defaults to, but that isn't always the version your scripts or virtual environments are using.

Inside a Python script or interactive session: