[Python-Dev] PEP 563: Postponed Evaluation of Annotations (original) (raw)

Luca Sbardella luca.sbardella at gmail.com
Fri Nov 3 20:09:24 EDT 2017

Impressive stats! I didn’t know this command, thanks!

On Fri, 3 Nov 2017 at 20:47, Barry Warsaw <barry at python.org> wrote:

On Nov 2, 2017, at 23:22, Nick Coghlan <ncoghlan at gmail.com> wrote: > Another point worth noting is that merely importing the typing module > is expensive: > > $ python -m perf timeit -s "from importlib import reload; import > typing" "reload(typing)" > ..................... > Mean +- std dev: 10.6 ms +- 0.6 ms > > 10 ms is a big chunk out of a CLI application's startup time budget. > Far and away so, except for the re module. > % ./python.exe -X importtime -c "import typing" import time: self [us] | cumulative | imported package import time: 72 | 72 | codecs import time: 625 | 696 | codecs import time: 354 | 354 | encodings.aliases import time: 713 | 1762 | encodings import time: 198 | 198 | encodings.utf8 import time: 98 | 98 | signal import time: 233 | 233 | encodings.latin1 import time: 353 | 353 | weakrefset import time: 264 | 617 | abc import time: 402 | 1018 | io import time: 136 | 136 | stat import time: 197 | 333 | stat import time: 227 | 227 | genericpath import time: 377 | 604 | posixpath import time: 2812 | 2812 | collectionsabc import time: 787 | 4534 | os import time: 315 | 315 | sitebuiltins import time: 336 | 336 | sitecustomize import time: 114 | 114 | usercustomize import time: 1064 | 6361 | site import time: 160 | 160 | operator import time: 1412 | 1571 | operator import time: 371 | 371 | keyword import time: 817 | 817 | heapq import time: 762 | 1579 | heapq import time: 272 | 272 | itertools import time: 635 | 635 | reprlib import time: 99 | 99 | collections import time: 3580 | 8104 | collections import time: 112 | 112 | functools import time: 781 | 892 | functools import time: 1774 | 2666 | contextlib import time: 272 | 272 | types import time: 861 | 1132 | enum import time: 76 | 76 | sre import time: 426 | 426 | sreconstants import time: 446 | 872 | sreparse import time: 414 | 1361 | srecompile import time: 79 | 79 | locale import time: 190 | 190 | copyreg import time: 17200 | 19961 | re import time: 374 | 374 | collections.abc import time: 15124 | 46226 | typing > -Barry > _________________________ Python-Dev mailing list Python-Dev at python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/luca.sbardella%40gmail.com

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