![]() PEP 615, Support for the IANA Time Zone Database in the Standard Library.PEP 602, Python adopts a stable annual release cadence.PEP 593, Flexible function and variable annotations.PEP 585, Type Hinting Generics In Standard Collections. ![]() Some of the new major new features and changes in Python 3.9 are: Major new features of the 3.9 series, compared to 3.8 Python 3.9 is incompatible with this unsupported version of Windows. The installer now also actively disallows installation on Windows 7. This is the first version of Python to default to the 64-bit installer on Windows. To see which changes are currently cherry-picked for inclusion in 3.9.0, look at the short-lived branch-v3.9.0 on GitHub. If you need the release manager to cherry-pick any critical fixes, mark issues as release blockers and/or add him as a reviewer on a critical backport PR on GitHub. ![]() To maximize stability, the final release will be cut from the v3.9.0rc2 tag. The 3.9 branch is now accepting changes for 3.9.1. Please keep in mind that this is a preview release and its use is not recommended for production environments. As always, report any issues to the Python bug tracker. In the mean time, we strongly encourage maintainers of third-party Python projects to prepare their projects for 3.9 compatibility during this phase. This release, 3.9.0rc2, is the last preview before the final release of Python 3.9.0 on. 17, 2020 This is the second release candidate of Python 3.9
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