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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,


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 536b390dde6c460acd28c260950ce208 24.1 MB SIG
XZ compressed source tarball Source release 693a4a5ce7a1c1149d29187b37d3850f 17.8 MB SIG
macOS 64-bit universal2 installer macOS for macOS 10.9 and later, including macOS 11 Big Sur on Apple Silicon (experimental) e9c7fbd89f5f16984afa0e6c7a3a8b24 35.5 MB SIG
Windows installer (64-bit) Windows Recommended ae722c8f4fbda955f7294b7b3b4108c1 26.8 MB SIG
Windows installer (32-bit) Windows 5d91b61c28255ffd74a4c1f9d14d9237 25.8 MB SIG
Windows help file Windows 796b0743be9ccd2619002dc14be1ac2e 8.4 MB SIG
Windows embeddable package (64-bit) Windows d08bcdd2a8b28e312a4b695c4340a70c 8.0 MB SIG
Windows embeddable package (32-bit) Windows 43c77ff67f7fffcfd25d84c1076f3a5a 7.2 MB SIG