Impressive stats! I didn’t know this command, thanks! On Fri, 3 Nov 2017 at 20:47, Barry Warsaw <ba...@python.org> wrote:
> On Nov 2, 2017, at 23:22, Nick Coghlan <ncogh...@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.utf_8 > import time: 98 | 98 | _signal > import time: 233 | 233 | encodings.latin_1 > 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 | _collections_abc > 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 | sre_constants > import time: 446 | 872 | sre_parse > import time: 414 | 1361 | sre_compile > 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@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/luca.sbardella%40gmail.com > -- http://lucasbardella.com
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