---
title: Python-SDK - 3.1.0
slug: feature-experimentation/release-notes/python-sdk-3-1-0
docTags: 
createdAt: 2026-07-20T15:44:51.354Z
---

\## \[3.1.0] - May 3rd, 2019

\## New Features:

\- Introduced Decision notification listener to be able to record:
\- Variation assignments for users activated in an experiment.
\- Feature access for users.
\- Feature variable value for users.

\## Bug Fixes:

\- Feature variable APIs now return default variable value when
featureEnabled property is false.
(\[\\\\#171]\([https://github.com/optimizely/python-sdk/pull/171](https://github.com/optimizely/python-sdk/pull/171)))

\## Deprecated:

\- Activate notification listener is deprecated as of this release.
Recommendation is to use the new Decision notification listener.
Activate notification listener will be removed in the next major
release.

[https://github.com/optimizely/python-sdk/releases/tag/3.1.0](https://github.com/optimizely/python-sdk/releases/tag/3.1.0)