On behalf of the entire Python development community, and the currently serving Python release team in particular, I’m pleased to announce the release of Python 3.9.0b3. Get it here:


Wait, Beta 3? What happened to Beta 2?

Beta 2? Speak of him no more. We disappeared him. He was a bad release. Truly awful. I get shivers just thinking about it. Never mention that name again in this house.

I mean, long story short, in Beta 2 you couldn’t do urllib.request.urlopen("https://www.python.org").read() because it wouldn’t find root certificates due to a bug. Since this was a problem only apparent on an installed Python, it wasn’t identified by unit tests and was only found by Ned while he was testing his Mac installer. By the time we learned of the severity of the bug I already tagged and published the release on python.org. That’s why we couldn’t just re-do the release under the same version.

Sorry for the trouble. We’re tweaking our release process to catch this problem sooner in future releases. Now, back to regular programming…

This is a beta preview of Python 3.9

Python 3.9 is still in development. This release, 3.9.0b3, is the third of five planned beta release previews.

Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release.

Call to action

We strongly encourage maintainers of third-party Python projects to test with 3.9 during the beta phase and report issues found to the Python bug tracker as soon as possible. While the release is planned to be feature complete entering the beta phase, it is possible that features may be modified or, in rare cases, deleted up until the start of the release candidate phase (2020-08-10). Our goal is have no ABI changes after beta 5 and as few code changes as possible after 3.9.0rc1, the first release candidate. To achieve that, it will be extremely important to get as much exposure for 3.9 as possible during the beta phase.

Please keep in mind that this is a preview release and its use is not recommended for production environments.

Major new features of the 3.9 series, compared to 3.8

Some of the new major new features and changes in Python 3.9 are:

The next pre-release, the fourth beta release of Python 3.9, will be 3.9.0b4. It is currently scheduled for 2020-06-29.

More resources

Your friendly release team,
Ned Deily @nad
Steve Dower @steve.dower
Łukasz Langa @ambv