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# Python 2.7

App Engine currently supports two versions of Python: 2.5 and 2.7. Python 2.7 incorporates many new features, including multithreading, concurrent requests, and a variety of updated libraries and features. Some of the updates can break your application. This documentation provides basic instructions for upgrading your application and addressing the most common backward-compatibility issues.

- What's New in Python 2.7
- Using Python 2.7