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Python 3.10.0a3

Release Date: Dec. 7, 2020

This is an early developer preview of Python 3.10

Major new features of the 3.10 series, compared to 3.9

Python 3.10 is still in development. This releasee, 3.10.0a3 is the second of six planned alpha releases. Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process. During the alpha phase, features may be added up until the start of the beta phase (2021-05-03) and, if necessary, may be modified or deleted up until the release candidate phase (2021-10-04). Please keep in mind that this is a preview release and its use is not recommended for production environments.

Many new features for Python 3.10 are still being planned and written. Among the new major new features and changes so far:

  • PEP 623 -- Remove wstr from Unicode
  • PEP 604 -- Allow writing union types as X | Y
  • PEP 612 -- Parameter Specification Variables
  • PEP 626 -- Precise line numbers for debugging and other tools.
  • bpo-38605: from __future__ import annotations (PEP 563) is now the default.
  • PEP 618 -- Add Optional Length-Checking To zip.

  • (Hey, fellow core developer, if a feature you find important is missing from this list, let Pablo know.)

The next pre-release of Python 3.10 will be 3.10.0a4, currently scheduled for 2021-01-04.

More resources

And now for something completely different

In mathematics, a Borwein integral is an integral whose unusual properties were first presented by mathematicians David Borwein and Jonathan Borwein in 2001. These integrals are remarkable for exhibiting apparent patterns that eventually break down. The following is an example:

This pattern continues up to

At the next step the obvious pattern fails,


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