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A number of Python modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt, _functools, _json, _locale, operator, resource, time, _weakref) now use multiphase initialization as defined by PEP 489.

A number of Python builtins (range, tuple, set, frozenset, list, dict) are now sped up using PEP 590 vectorcall.

BPO 1635741, when Python is initialized multiple times in the same process, it does not leak memory anymore.

BPO 39926, Unicode support updated to version 13.0.0.

BPO 38692, os.pidfd_open added that allows process management without races and signals.

BPO 38379, garbage collection does not block on resurrected objects.

PEP 616, String methods to remove prefixes and suffixes.

PEP 615, Support for the IANA Time Zone Database in the Standard Library.

PEP 614, Relaxing Grammar Restrictions On Decorators.

PEP 602, Python adopts a stable annual release cadence.

PEP 593, Flexible function and variable annotations.

PEP 585, Type Hinting Generics In Standard Collections.

PEP 573, Module State Access from C Extension Methods.

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

bpo-43439: Add audit hooks for gc.get_objects(), gc.get_referrers() and gc.get_referents().Code that requires the former vulnerable behavior may set a trust_server_pasv_ipv4_address attribute on their ftplib.FTP instances to True to re-enable it. This prevents a malicious FTP server from using the response to probe IPv4 address and port combinations on the client network. bpo-43285: ftplib no longer trusts the IP address value returned from the server in response to the PASV command by default.Vulnerability reported by David Schwörer. Moreover, even source code of Python modules can contain sensitive data like passwords. bpo-42988: CVE-2021-3426: Remove the getfile feature of the pydoc module which could be abused to read arbitrary files on the disk (directory traversal vulnerability).bpo-43631: high-severity CVE-2021-3449 and CVE-2021-3450 were published for OpenSSL, it's been upgraded to 1.1.1k in CI, and macOS and Windows installers.To reiterate, Python 3.9.3 was itself an expedited release due to its security content: Upgrading is highly recommended to all users.

Python 3.9.4 is a hotfix release addressing an unintentional ABI incompatibility introduced in Python 3.9.3.

Python 3.11 is now the latest feature release series of Python 3. Note: The release you're looking at is Python 3.9.4, a bugfix release for the legacy 3.9 series. Release Date: ApThis is the fourth maintenance release of Python 3.9

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