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This is the first release candidate of Python 3.9
This release, 3.9.0rc1, is the penultimate release preview. Entering the release candidate phase, only reviewed code changes which are clear bug fixes are allowed between this release candidate and the final release. The second candidate and the last planned release preview is currently planned for 2020-09-14.
Call to action
We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.9 compatibility during this phase. As always, report any issues to the Python bug tracker.
Please keep in mind that this is a preview release and its use is not recommended for production environments.
Installer news
This is the first version of Python to default to the 64-bit installer on Windows. The installer now also actively disallows installation on Windows 7. Python 3.9 is incompatible with this unsupported version of Windows.
Major new features of the 3.9 series, compared to 3.8
Some of the new major new features and changes in Python 3.9 are:
- PEP 584, Union Operators in
dict
- PEP 585, Type Hinting Generics In Standard Collections
- PEP 593, Flexible function and variable annotations
- PEP 602, Python adopts a stable annual release cadence
- PEP 615, Support for the IANA Time Zone Database in the Standard Library
- PEP 616, String methods to remove prefixes and suffixes
- PEP 617, New PEG parser for CPython
- BPO 38379, garbage collection does not block on resurrected objects;
- BPO 38692, os.pidfd_open added that allows process management without races and signals;
- BPO 39926, Unicode support updated to version 13.0.0;
- BPO 1635741, when Python is initialized multiple times in the same process, it does not leak memory anymore;
- A number of Python builtins (range, tuple, set, frozenset, list, dict) are now sped up using PEP 590 vectorcall;
- 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 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.)
More resources
- PEP 596, 3.9 Release Schedule
- Report bugs at https://bugs.python.org.
- Help fund Python and its community.
And now for something completely different
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Announcer: Does that answer your question?
Norman: (Michael Palin) Hello.
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Woman: Vic?
Version | Operating System | Description | MD5 Sum | File Size | GPG |
---|---|---|---|---|---|
Gzipped source tarball | Source release | f98d8ac7c8b2bf3fd887d989dbb0f2b8 | 25247669 | SIG | |
XZ compressed source tarball | Source release | 835f3cb29e4065b9a2dea1c7b9bfc37f | 18798364 | SIG | |
macOS 64-bit installer | Mac OS X | for OS X 10.9 and later | 0297dcb8f82ae5f27f8b4bff1613e994 | 29640671 | SIG |
Windows help file | Windows | 4d6fd98c7cc1ce8525e5c66a0a5eb9e0 | 8734372 | SIG | |
Windows x86-64 embeddable zip file | Windows | for AMD64/EM64T/x64 | 636807ae74e4314dca2f8bbbdbdf2684 | 8384341 | SIG |
Windows x86-64 executable installer | Windows | for AMD64/EM64T/x64 | ba2192e04064e3bb846e130cc00bd7cd | 28072336 | SIG |
Windows x86-64 web-based installer | Windows | for AMD64/EM64T/x64 | f35f63685c76fe946c53bb5a716f159a | 1363840 | SIG |
Windows x86 embeddable zip file | Windows | 9e4daceb329431ae83f39216ef1e2e26 | 7550372 | SIG | |
Windows x86 executable installer | Windows | ad2f7849189581dedbb7dcf163717c46 | 26978744 | SIG | |
Windows x86 web-based installer | Windows | ab79535243e9834a0ee15cfe109a77ee | 1328400 | SIG |
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Python on a Macintosh running Mac OS X is in principle very similar to Python onany other Unix platform, but there are a number of additional features such asthe IDE and the Package Manager that are worth pointing out. Sony vegas download latest version.
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Mac OS X 10.8 comes with Python 2.7 pre-installed by Apple. Mookambika devi songs free download. If you wish, youare invited to install the most recent version of Python 3 from the Pythonwebsite (https://www.python.org). A current “universal binary” build of Python,which runs natively on the Mac’s new Intel and legacy PPC CPU’s, is availablethere.
What you get after installing is a number of things:
- A
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If you are familiar with Python on other Unix platforms you should read thesection on running Python scripts from the Unix shell.
4.1.1. How to run a Python script¶
Your best way to get started with Python on Mac OS X is through the IDLEintegrated development environment, see section The IDE and use the Help menuwhen the IDE is running.
If you want to run Python scripts from the Terminal window command line or fromthe Finder you first need an editor to create your script. Mac OS X comes with anumber of standard Unix command line editors, vim andemacs among them. If you want a more Mac-like editor,BBEdit or TextWrangler from Bare Bones Software (seehttp://www.barebones.com/products/bbedit/index.html) are good choices, as isTextMate (see https://macromates.com/). Other editors includeGvim (http://macvim-dev.github.io/macvim/) and Aquamacs(http://aquamacs.org/).
To run your script from the Terminal window you must make sure that
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4.1.2. Running scripts with a GUI¶
With older versions of Python, there is one Mac OS X quirk that you need to beaware of: programs that talk to the Aqua window manager (in other words,anything that has a GUI) need to be run in a special way. Use pythonwinstead of python to start such scripts.
With Python 3.8, you can use either python or pythonw.
4.1.3. Configuration¶
Python on OS X honors all standard Unix environment variables such as
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4.2. The IDE¶
MacPython ships with the standard IDLE development environment. A goodintroduction to using IDLE can be found athttp://www.hashcollision.org/hkn/python/idle_intro/index.html.
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There are several methods to install additional Python packages:
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There are several options for building GUI applications on the Mac with Python.
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wxPython is another popular cross-platform GUI toolkit that runs natively onMac OS X. Packages and documentation are available from https://www.wxpython.org.
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4.5. Distributing Python Applications on the Mac¶
The standard tool for deploying standalone Python applications on the Mac ispy2app. More information on installing and using py2app can be foundat http://undefined.org/python/#py2app.
4.6. Other Resources¶
The MacPython mailing list is an excellent support resource for Python users anddevelopers on the Mac:
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Another useful resource is the MacPython wiki: