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Python 3.9.0a3

Release Date: Jan. 24, 2020

This is an early developer preview of Python 3.9

Python 3.9 is still in development. This release, 3.9.0a3 is the third 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 (2020-05-18) and, if necessary, may be modified or deleted up until the release candidate phase (2020-08-10). 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

Many new features for Python 3.9 are still being planned and written. Among the new major new features and changes so far:

  • PEP 602, Python adopts a stable annual release cadence
  • BPO 38379, garbage collection does not block on resurrected objects;
  • BPO 38692, os.pidfd_open added that allows process management without races and signals;
  • A number of standard library modules (audioop, ast, grp, _hashlib, pwd, _posixsubprocess, random, select, struct, termios, zlib) are now using the stable ABI defined by PEP 384.

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

The next pre-release of Python 3.9 will be 3.9.0a4, currently scheduled for 2020-02-17.

More resources

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Full Changelog


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 8d15777d0b23f14d368e76acc378e933 23.1 MB SIG
XZ compressed source tarball Source release 8ea79726b42dfd5b9485350fcc82e0bb 17.2 MB SIG
macOS 64-bit installer macOS for OS X 10.9 and later 13df981186619120fb2b00ed055511ac 27.0 MB SIG
Windows help file Windows 149df69348e9fcddb06e855c301cd408 8.2 MB SIG
Windows x86 embeddable zip file Windows 0db09e93ca8c1f530ace2de4a7793c74 6.9 MB SIG
Windows x86 executable installer Windows 4bcd049c0dceca8dac950110a7d06327 25.4 MB SIG
Windows x86 web-based installer Windows f47d3d72adc399e0d2c6cd2159d19931 1.3 MB SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64 427a45ac072a908b02d8c4ad86f2b481 7.7 MB SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64 f1b8712b2b254c2dca45accb622fafb7 26.5 MB SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64 266696062016b23a1f6b6881a8db3325 1.3 MB SIG