[Python-Dev] Re: Adding a "call_once" decorator to functools
01.05.20 01:23, Paul Ganssle пише: class LazyList: def __init__(self, some_iterator): self._iter = some_iterator self._list = None @call_once def as_list(self): self._list = list(self._iter) return self._list call_once is not applicable here, because it is only for functions which do not have arguments, but as_list() takes the self argument. ___ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/IQJJOO47QCZC5RFG42BPNGO43Z6VNHVR/ Code of Conduct: http://python.org/psf/codeofconduct/
[Python-Dev] For-If syntax
I hope this isn't too noobish, nothing on the list comes up in Google, but I'm curious why the construct for x in y if x.is_some_thing: # do a thing isn't legal. That seems a very Pythonic symmetry with lambdas. The equivalent syntax required right now is, for x in [x for x in y if x.is_some_thing]: # do a thing Of course there's more flexibility in the full syntax, but is there any interest in the simpler, more performant one-line syntax? Em ___ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/VHFUQFEF3TCI6LHLBAUEKMFM2A6V3CQO/ Code of Conduct: http://python.org/psf/codeofconduct/
[Python-Dev] Re: For-If syntax
Questions like this are best asked on python-ideas. Specifically, though, you can get the same result with: for x in (n for n in y if n.is_some_thing): without requiring new syntax. ___ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/LBI4JNJ6CIG5VDRVJ6EYV52IIWV5AXUG/ Code of Conduct: http://python.org/psf/codeofconduct/
[Python-Dev] Python Language Summit 2020 blog posts
(x-posting to python-dev and python-committters) Just wanted to share that the first 7 of 11 blog posts about presentations and discussions from Python Language Summit are now up for your enjoyment. Main article: https://pyfound.blogspot.com/2020/04/the-2020-python-language-summit.html Day 1: All strings become f-strings, Eric V Smith: https://pyfound.blogspot.com/2020/04/all-strings-become-f-strings-python.html Replacing CPython’s Parser with a PEG-based parser, Pablo Galindo, Lysandros Nikolaou, Guido van Rossum: https://pyfound.blogspot.com/2020/04/replacing-cpythons-parser-python.html A Formal Specification for the (C)Python Virtual Machine, Mark Shannon: https://pyfound.blogspot.com/2020/04/a-formal-specification-for-cpython.html HPy: a Future-Proof Way of Extending Python?, Antonio Cuni: https://pyfound.blogspot.com/2020/04/hpy-future-proof-way-of-extending.html CPython Documentation: The Next 5 Years, Carol Willing, Ned Batchelder: https://pyfound.blogspot.com/2020/04/cpython-documentation-next-5-years.html Day 2: Lightning talks: ( https://pyfound.blogspot.com/2020/04/lightning-talks-part-1.html) - What do you need from pip, PyPI, and packaging?, Sumana Harihareswara - A Retrospective on My "Multi-Core Python" Project, Eric Snow The Path Forward for Typing, Guido van Rossum: https://pyfound.blogspot.com/2020/04/the-path-forward-for-typing-python.html Stay tuned for more posts! Property-Based Testing for Python Builtins and the Standard Library, Zac Hatfield-Dodds Core Workflow Updates, Mariatta Wijaya CPython on Mobile Platforms, Russell Keith-Magee Few more lightning talks from Eric Holscher and Zac Hatfield-Dodds Enjoy! ___ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/5DJJ7NBAWRJROGQLGMXVMC5P5OFO2EUX/ Code of Conduct: http://python.org/psf/codeofconduct/
[Python-Dev] Re: Python Language Summit 2020 blog posts
> > Few more lightning talks from Eric Holscher and Zac Hatfield-Dodds > > ... and Jim Baker ___ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/UOYUCHETJOF3ZJYGKLJ72JVO5FWT27DM/ Code of Conduct: http://python.org/psf/codeofconduct/
[Python-Dev] Summary of Python tracker Issues
ACTIVITY SUMMARY (2020-04-24 - 2020-05-01) Python tracker at https://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open7427 (-25) closed 44793 (+118) total 52220 (+93) Open issues with patches: 2954 Issues opened (74) == #25597: unittest.mock does not wrap dunder methods (__getitem__ etc) https://bugs.python.org/issue25597 reopened by xtreak #29587: Generator/coroutine 'throw' discards exc_info state, which is https://bugs.python.org/issue29587 reopened by gvanrossum #37340: remove free_list for bound method objects https://bugs.python.org/issue37340 reopened by rhettinger #40246: Different error messages for same error - invalid string prefi https://bugs.python.org/issue40246 reopened by vstinner #40335: [PEP 617 new parser] Regression in multiline SyntaxError offse https://bugs.python.org/issue40335 reopened by Anthony Sottile #40379: multiprocessing's default start method of fork()-without-exec( https://bugs.python.org/issue40379 opened by itamarst #40380: OS-related test failures on Linux in Python 3.8.2 https://bugs.python.org/issue40380 opened by Steven Fleck #40381: plistlib doesn't handle poorly-formatted plists https://bugs.python.org/issue40381 opened by Clay Caviness #40382: Make 'rt' the default for open in docs https://bugs.python.org/issue40382 opened by facundobatista #40383: weakref class name are hardcoded in reprs https://bugs.python.org/issue40383 opened by OhBonsai #40384: IDLE: Wrong highlighting when \n follows def/class https://bugs.python.org/issue40384 opened by Alex-Python-Programmer #40390: Implement _xxsubinterpreters.channel_send_wait(). https://bugs.python.org/issue40390 opened by benedwards14 #40391: io.FileIO.mode doesn't comply with the docs https://bugs.python.org/issue40391 opened by mike.parker #40393: Auto-response from Python Help points to Python 2 reference https://bugs.python.org/issue40393 opened by J Arun Mani #40395: Scripts folder is Empty in python 3.8.2 for Windows 7. https://bugs.python.org/issue40395 opened by BenTen Jan #40397: Refactor typing._GenericAlias https://bugs.python.org/issue40397 opened by serhiy.storchaka #40398: get_args(Callable) fails https://bugs.python.org/issue40398 opened by serhiy.storchaka #40399: IO streams locking can be broken after fork() with threads https://bugs.python.org/issue40399 opened by Delgan #40400: Mac build-installer.py doesn't support new plist format https://bugs.python.org/issue40400 opened by h2a10 #40402: Race condition in multiprocessing/connection.py: broken handle https://bugs.python.org/issue40402 opened by maxicooper #40403: pdb does not drop into debugger upon SyntaxError caused by ast https://bugs.python.org/issue40403 opened by Kerrick Staley #40404: Python quit unexpectedly https://bugs.python.org/issue40404 opened by drliu #40405: asyncio.as_completed documentation misleading https://bugs.python.org/issue40405 opened by bar.harel #40406: MagicMock __aenter__ should be AsyncMock(return_value=MagicMoc https://bugs.python.org/issue40406 opened by graingert #40407: Zipfile couldn`t recognized character set rightly. https://bugs.python.org/issue40407 opened by ê¹ì§í #40408: GenericAlias does not support nested type variables https://bugs.python.org/issue40408 opened by serhiy.storchaka #40409: urllib.parse.urlsplit parses schemes that do not begin with le https://bugs.python.org/issue40409 opened by sgg #40410: test_multiprocessing_forktest_terminate() timed out after 15 m https://bugs.python.org/issue40410 opened by vstinner #40412: inittab_copy not set to NULL after free, can lead to crashes w https://bugs.python.org/issue40412 opened by indygreg #40413: Py_RunMain() crashes on subsequence call https://bugs.python.org/issue40413 opened by indygreg #40414: Incorrect mouse and keyboard mapping https://bugs.python.org/issue40414 opened by Jah-On #40416: Calling TextIOWrapper.tell() in the middle of reading a gb2312 https://bugs.python.org/issue40416 opened by rmalouf #40417: PyImport_ReloadModule emits deprecation warning https://bugs.python.org/issue40417 opened by Robert Rouhani #40418: Small Refactoring: Use bytes.hex() in secrets.token_hex() https://bugs.python.org/issue40418 opened by Dennis Sweeney #40419: timeit CLI docs still mention old power sequence https://bugs.python.org/issue40419 opened by Energya #40420: argparse choices formatter https://bugs.python.org/issue40420 opened by Leonid Ilyevsky #40421: [C API] Add getter functions for PyFrameObject and maybe move https://bugs.python.org/issue40421 opened by vstinner #40422: Light refactor: create a common _Py_closerange API https://bugs.python.org/issue40422 opened by kevans91 #40423: Optimization: use close_range(2) if available https://bugs.python.org/issue40423 opened by kevans91 #40424: AIX: parallel build and ld WARNINGS http
[Python-Dev] Re: For-If syntax
On 5/1/20 9:19 AM, silverback...@gmail.com wrote: I hope this isn't too noobish, nothing on the list comes up in Google, but I'm curious why the construct for x in y if x.is_some_thing: # do a thing But this is probably clearer (and has the same syntax): for x in y: if x.is_some_thing: # do a thing Cramming two separate thoughts onto a single line is probably *not* clearer. isn't legal. That seems a very Pythonic symmetry with lambdas. The equivalent syntax required right now is, for x in [x for x in y if x.is_some_thing]: # do a thing Of course there's more flexibility in the full syntax, but is there any interest in the simpler, more performant one-line syntax? Em ___ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/VHFUQFEF3TCI6LHLBAUEKMFM2A6V3CQO/ Code of Conduct: http://python.org/psf/codeofconduct/ -- Dr. Gary Herron Professor of Computer Science DigiPen Institute of Technology (425) 895-4418 ___ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/T3VQGGAHYR4AOKMVPL5NDTAV2GB6BIAH/ Code of Conduct: http://python.org/psf/codeofconduct/
