> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fiddler.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Python Version Support Policy

> How Fiddler's Python SDKs decide which Python versions they support, and when support for a version ends.

Fiddler's Python SDKs follow a clear, predictable policy for which Python versions they support. This page explains that policy so you can plan Python upgrades with confidence.

### Our policy

Fiddler supports each Python version through its official Python Software Foundation (PSF) end-of-life, and drops support once a version reaches PSF end-of-life. This keeps Fiddler's SDKs aligned with Python versions that still receive upstream security patches.

The PSF publishes the end-of-life date for every Python version in its [Status of Python versions](https://devguide.python.org/versions/) table — the source of truth for when a version's support ends. Keeping your projects on a version that the PSF still supports is the most reliable way to stay on a Fiddler-supported Python. Fiddler communicates upcoming changes ahead of time so you have room to upgrade.

This window — support through PSF end-of-life — is more generous than community policies such as [SPEC 0](https://scientific-python.org/specs/spec-0000/) and the superseded [NEP 29](https://numpy.org/neps/nep-0029-deprecation_policy.html), which drop older Python versions sooner.

### Which SDKs this applies to

This policy applies to all of Fiddler's [Python SDKs](/sdk-api). Fiddler's JavaScript and TypeScript SDKs are not affected by Python version changes.

### How this differs from the compatibility matrix

Two references cover Python and Fiddler versions, and they answer different questions:

* This **Python version support policy** describes which **Python language** versions Fiddler's Python SDKs run on.
* The [compatibility matrix](/changelog/compatibility-matrix) maps each **Fiddler Python client version** to the **Fiddler platform** versions it works with.

Use this page to choose a supported Python version, and the compatibility matrix to choose a client version that matches your Fiddler platform.

### Related resources

* [Compatibility matrix](/changelog/compatibility-matrix) — Python client and Fiddler platform version compatibility.
* [SDK & API reference](/sdk-api) — every Fiddler SDK.
* [Feature maturity definitions](/reference/feature-maturity-definitions) — Fiddler's release and support stages.
* [Status of Python versions](https://devguide.python.org/versions/) — PSF end-of-life dates.