What may be new in Python 3.4

Slides from PyCon.DE 2013, Cologne

Transcript

1. What's new What may be new in Python 3.4 PyCon.DE 2013, Köln Christian Heimes <christian@python.org> @ChristianHeimes
2. OS/2 entfernt Windows XP weiter unterstützt
3. PEP 435 enum >>> from enum import Enum >>> class Color(Enum): ... red = 1 ... green = 2 ... blue = 3 (Barry Warsaw, Eli Bendersky, Ethan Furman)
4. PEP 450 statistics module mean() variations() ... (Steven D'Aprano)
5. PEP 445 customize Python memory allocators malloc() resize() free() (Victor Stinner)
6. PEP 454 tracemalloc module Debugging und Analyse von Speicherverbrauch (Victor Stinner)
7. PEP 453 explicit bootstrapping of PIP $ python -m ensurepip (Donald Stufft, Nick Coghlan)
8. PEP 427 Wheel Binary Package Format Installationsformat (nicht importierbar, kein egg-Ersatz) Multiversion / Multiplattform Signed Packages (Daniel Holth)
9. PEP 425 Compatibility Tags for Built Distributions py33-none-any cp33-cp33m-linux_x86_64 cp33-abi3-win_amd64 (Daniel Holth)
10. PEP 428 pathlib module (?) >>> p = Path('docs') >>> for child in p: child ... PosixPath('docs/conf.py') PosixPath('docs/_templates') ... >>> p.isfile() True (Antoine Pitrou)
11. PEP 431 time zone support pytz für stdlib Updates über tzdata-update verschoben :( (Lennart Regebro)
12. PEP 436 Argument Clinic DSL Domain Specific Language für PyArg_ParseTupleAndKeywords() aka Introspection für builtins (Larry Hastings)
13. PEP 451 ModuleSpec Type for the Import System module finder ↓ module spec ↓ module loader (Eric Snow)
14. PEP 452 API for Crypto Hash Function v2.0 digest.name digest.block_size naming scheme bytes (Christian Heimes, AM Kuchling)
15. PEP 3156 Async IO support aka „Tulip“ Twisted / Tornado pluggable event loop + protocol abstraction selector schon in 3.4 (Guido van Rossum, et. al.)
16. PEP 456 Secure and interchangeable hash algorithm Dan Bernsteins SipHash24 als Hash-Algorithmus für str, bytes, memoryview (Christian Heimes)
17. PEP 424 A method for exposing a length hint __length_hint__() (Alex Gaynor)
18. PEP 447 Add __locallookup__ method to metaclass def lookup(mro_list, name): for cls in mro_list: if name in cls.__dict__: return cls.__dict__ return NotFound def lookup(mro_list, name): for cls in mro_list: try: return cls.__locallookup__(name) except AttributeError: pass return NotFound (Ronald Oussoren)
19. Crypto SSL-Modul-Verbesserungen SHA-3 (Keccak) PBKDF2 os.urandom() (Christian Heimes, Antoine Pitrou)
20. Python Startup tip compared to v3.4.0a3: ### normal_startup ### Min: 0.506533 -> 0.313627: 1.62x faster Avg: 0.582504 -> 0.441796: 1.32x faster Significant (t=19.98) Stddev: 0.02397 -> 0.04366: 1.8213x larger (Antoine Pitrou, Victor Stinner, Christian Heimes)