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bpo-42222: Modernize integer test/conversion in randrange()#23064

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rhettinger merged 9 commits into
python:masterfrom
rhettinger:fast_randrange
Dec 28, 2020
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bpo-42222: Modernize integer test/conversion in randrange()#23064
rhettinger merged 9 commits into
python:masterfrom
rhettinger:fast_randrange

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@rhettinger

@rhettinger rhettinger commented Oct 31, 2020 •
edited by bedevere-bot
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Moves the int(x) == x test and conversion into the C code for operator.index().

Provides a 7% speed up:

$ pytime -s 'from random import randrange' 'randrange(15)'  # baseline
500000 loops, best of 11: 540 nsec per loop
$ pytime -s 'from random import randrange' 'randrange(15)'   # new versio
500000 loops, best of 11: 502 nsec per loop

It should become even faster when we get a zero-cost try.

It's odd that non-integers raise a ValueError. I think that should have been TypeError.

https://bugs.python.org/issue42222

@rhettinger rhettinger added the performance Performance or resource usage label Oct 31, 2020
serhiy-storchaka
serhiy-storchaka reviewed Oct 31, 2020
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Currently you are on the way to #19112 (which already has tests and documentation and cover corner cases).

@serhiy-storchaka serhiy-storchaka mentioned this pull request Oct 31, 2020
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This PR is stale because it has been open for 30 days with no activity. Remove stale label or comment or this will be closed in 5 days

@github-actions github-actions Bot added the stale Stale PR or inactive for long period of time. label Dec 16, 2020
@rhettinger rhettinger removed the stale Stale PR or inactive for long period of time. label Dec 24, 2020
@serhiy-storchaka

serhiy-storchaka commented Dec 24, 2020

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What about #19112?

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rhettinger commented Dec 24, 2020

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I merged in the relevant parts of #19112. The principal differences are:

  • The TypeError won't start being emitted until the after the deprecation period.
  • Improved wording for the doc entries.
  • Tests focus solely on the deprecations.
  • All existing behavior remains intact until after the deprecation.

@serhiy-storchaka

serhiy-storchaka commented Dec 24, 2020

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  • The TypeError won't start being emitted until the after the deprecation period.

As in #19112 initially. I changed ValueError to TypeError on your request.

  • Improved wording for the doc entries.

I would appreciate any suggestions to change wording.

  • Tests focus solely on the deprecations.

Yes, tests in #19112 cover more cases.

  • All existing behavior remains intact until after the deprecation.

As well as in #19112.

But this PR still has issues. It does not emit warning for randrange(10, 20, 1.0).

@rhettinger rhettinger merged commit a9621bb into python:master Dec 28, 2020
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bedevere-bot commented Dec 28, 2020

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@rhettinger: Please replace # with GH- in the commit message next time. Thanks!

adorilson pushed a commit to adorilson/cpython that referenced this pull request Mar 13, 2021
@rhettinger @adorilson
bpo-42222: Modernize integer test/conversion in randrange() (python#2… …
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…3064)
@AlexWaygood AlexWaygood mentioned this pull request Feb 4, 2022
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