Python 3.9.0 (2020-10-05 => TBD)

See also

• https://docs.python.org/3.9/whatsnew/3.9.html

• https://github.com/python/cpython/releases/tag/v3.9.0

• https://docs.python.org/3.9/whatsnew/changelog.html

• https://www.python.org/dev/peps/pep-0596/#schedule

• https://docs.python.org/3.9/whatsnew/changelog.html#changelog

• https://discuss.python.org/tag/release

• https://fediverse.org/llanga/status/1313207780954828808?s=20

• https://discuss.python.org/t/python-3-9-0-is-now-available-and-you-can-already-test-3-10-0a1/5375

https://fediverse.org/llanga/status/1313207780954828808?s=20

https://fediverse.org/llanga/status/1306535944451915776?s=20 https://docs.python.org/release/3.9.0rc2/whatsnew/changelog.html#python-3-9-0-release-candidate-2

https://fediverse.org/gvanrossum/status/1293323947690225666?s=20

https://fediverse.org/gvanrossum/status/1262766323626504192?s=20 Python 3.9b1 is out. Try it! Thanks to everyone who contributed, to @baybryj , @llanga , @zooba (the release team), and to @VictorStinner for so many things

https://www.python.org/dev/peps/pep-0596/#schedule

• Python 3.9.0 announces
  • Python 3.9 is now officially available! by Łukasz Langa 22h10 UTC+2
  • Python 3.9: Cool New Features for You to Try by Geir Arne Hjelle
    • Python 3.9: Cool New Features for You to Try by Geir Arne Hjelle
      • About Geir Arne Hjelle
      • Proper Time Zone Support ( zoneinfo module , PEP-0615)
      • Simpler Updating of Dictionaries (PEP-0584)
      • More Flexible Decorators
      • Annotated Type Hints
      • A More Powerful Python Parser (PEP-0617)
      • Other Pretty Cool Features
      • Greatest Common Divisor (GCD) and Least Common Multiple (LCM)
      • New HTTP Status Codes
      • Removal of Deprecated Compatibility Code
      • Conclusion
  • Python 3.9 par Serdar Yegulalp Serdar Yegulalp
    • Python 3.9 : des améliorations et des innovations par Serdar Yegulalp (adaptation Jean Elyan)
      • Introduction
      • Adoption d’un cycle annuel de publication
      • Python devient plus rapide par défaut
      • Plus de chaînes de caractères et de fonctions de dictionnaire
      • Les décorateurs perdent certaines restrictions
      • Nouvelles opérations de type
      • Améliorations des classes internes
      • Autres changements apportés à Python 3.9
  • Python 3.9: What’s New by Jan Giacomelli
    • Python 3.9: What’s New by Jan Giacomelli
      • Jan Giacomelli
      • Introduction
      • Development Cycle
      • Dictionary Unions
      • Updating dictionaries
      • Generating Random Bytes
      • String Methods removeprefix + removesuffix (PEP-0616)
      • IANA Timezone Support ( zoneinfo module )
      • Generic Type Annotations (list + dict, PEP-0585)
      • Canceling Concurrent Futures
      • ImportError
      • String Replace Fix, (bug 28029)
      • New Python Parser (PEP-0617)
      • Performance ( vectorcall protocol )
      • Conclusion
  • Sortie de Python 3.9 par Antoine Rozo (entwanne)
    • Sortie de Python 3.9 par Antoine Rozo
      • Antoine Rozo
      • Introduction
      • Méthodes removeprefix et removesuffix des chaînes de caractères (PEP 616)
      • Opérations ensemblistes sur les dictionnaires (PEP-0584)
      • Module zoneinfo ( zoneinfo module , PEP-0615)
      • Module graphlib
      • Types génériques natifs (list + dict, PEP-0585)
      • Refonte de l’analyseur syntaxique (PEP-0617)
      • Avertissements de dépréciation
      • Autres changements
  • 10 Awesome Python 3.9 Features by Farhad Malik
    • 10 Awesome Python 3.9 Features by Farhad Malik
      • Farhad Malik
      • Introduction
      • 2. Feature New Flexible High Performant PEG-Based Parser (PEP-0617)
      • 6. Feature: Ability To Cancel Concurrent Futures (issue 39349, Add “cancel_futures” parameter to concurrent.futures.Executor.shutdown())
      • 7. Feature: AsyncIO and multiprocessing Improvements (issue 30966, Add multiprocessing.queues.SimpleQueue.close() )
      • 8. Feature: Consistent Package Import Errors (issue 37444)
  • Video top 10 new things in python3.9 (beginner-intermediate) anthony explains #093 by Anthony Sottile
    • sys.stderr is now line buffered everywhere
    • ast.unparse function
    • __file__ of interactive scripts is now an absolute path
    • new functions in curses for tabsize / escdelay
    • decorators can be any expression
    • new modules (zoneinfo, graphlib)
• PEP 596 Python 3.9 Release Schedule
  • Release Manager and Crew
  • 3.9.0 schedule
    • Actual
    • Expected
• PEP-584 Add Union Operators To dict
  • New syntax
  • Examples
    • matplotlib/legend.py
    • pygments/lexer.py
• PEP 585 Builtin Generic Types (typing)
  • Description
• range, tuple, set, frozenset, list, dict are now sped up using PEP 590 vectorcall
  • Description
    • Other links
• PEP 593 add typing.Annotated (Flexible function and variable annotations)
  • Description
  • Motivating examples
    • Combining runtime and static uses of annotations
    • Lowering barriers to developing new typing constructs
  • Syntax
• PEP 0615 Support for the IANA Time Zone Database in the Standard Library
  • Pull request cpython/commit/62972d9d73e83d6e
  • Documentation
  • Accessing Time Zones
  • tzdata
  • Investigating Time Zones
  • Using Best Practices
  • Examples
    • Example 1
    • Example 2
• Math functions
  • Articles
    • https://martinheinz.dev
      • math.gcd
      • math.lcm
      • math.nextafter
      • math.ulp (Unit in the Last Place)
• PEP 616 String methods to remove prefixes and suffixes
  • Articles
    • https://martinheinz.dev
      • removeprefix
      • removesuffix
• PEP 617 New PEG Parser
  • Description
• _abc, audioop, … _functools, _json, operator, resource,… now use multiphase initialization as defined by PEP 489
  • Description
• Python 3.9 async news
  • A number of improvements have been made to the asyncio and multiprocessing library in this release
  • coroutine asyncio.to_thread(func, /, *args, **kwargs)
    • https://discuss.python.org/t/what-are-the-advantages-of-asyncio-over-threads/2112/26
    • https://discuss.python.org/t/ok-to-pass-loop-to-another-thread/3456/6
• Documentation
  • I contributed to Python 3.9 typing docs by Luciano Ramalho
• Python 3.9 concurrent.futures news
  • Ability To Cancel Concurrent Futures
    • Explanation
• new graphlib.TopologicalSorter class Topological Ordering
  • Lib/graphlib.py
  • Python 3.9 graphlib review
    • The Modules A, B, C, D example
    • RosettaCode task Example
• HTTP codes
  • Articles
    • https://martinheinz.dev
      • http.HTTPStatus
• IPv6 Scoped Addresses (RFC 4007)
  • Issue
  • Description
• Python 3.9 Feature Random Bytes Generation
  • Feature: Random Bytes Generation
• Conclusion
  • Articles
    • https://martinheinz.dev