# Python 3.15.0 alpha 3

DevFeed: [Python 3.15.0 alpha 3](<https://devfeed.tech/articles/python-3-15-0-alpha-3-2385.md>)

Original publisher: [Read original article](<https://blog.python.org/2025/12/python-3150-alpha-3/>)

Author: Hugo van Kemenade

Published: 2025-12-16T00:00:00Z

Content type: release

Language: en

Sources: [Python Insider](<https://devfeed.tech/sources/python-insider.md>)

Topics: [Python](<https://devfeed.tech/topics/python.md>), [releases](<https://devfeed.tech/topics/releases.md>)

Tags: [c](<https://devfeed.tech/tags/c.md>), [core](<https://devfeed.tech/tags/core.md>), [developer](<https://devfeed.tech/tags/developer.md>), [pre-release](<https://devfeed.tech/tags/pre-release.md>), [profiling](<https://devfeed.tech/tags/profiling.md>), [release](<https://devfeed.tech/tags/release.md>), [release-schedule](<https://devfeed.tech/tags/release-schedule.md>), [releases](<https://devfeed.tech/tags/releases.md>)

## AI overview

Python 3.15.0 alpha 3 is an early developer preview and the third of seven planned alpha releases. It introduces a statistical sampling profiler, UTF-8 as the default encoding, a new C API for creating Python bytes objects, and improved error messages.

## Source excerpt

This is an early developer preview of Python 3.15 www.python.org/downloads/release/python-3150a3/ Major new features of the 3.15 series, compared to 3.14 Pyt...