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Title: gh-118761: Optimise import time for ast by AA-Turner · Pull Request #131953 · python/cpython · GitHub

Open Graph Title: gh-118761: Optimise import time for ast by AA-Turner · Pull Request #131953 · python/cpython

X Title: gh-118761: Optimise import time for ast by AA-Turner · Pull Request #131953 · python/cpython

Description: Attempting @JelleZijlstra's suggestion in #118761 (comment). Running python -Ximporttime -Sc "import ast" ten times with the current and proposed modules, I get 14.1ms for the current module and 1.48ms for the new, for a ~12ms speed up. I've left numbers out of the NEWS entry for now, as I've only tested on a Windows PC -- Linux may have different performance profiles. Full Times (using the last line of each output) Current import time: self [us] | cumulative | imported package import time: 1277 | 13904 | ast import time: 1363 | 14813 | ast import time: 1343 | 14246 | ast import time: 1330 | 14280 | ast import time: 1387 | 13974 | ast import time: 1373 | 13837 | ast import time: 1345 | 14456 | ast import time: 1349 | 14050 | ast import time: 1322 | 14226 | ast import time: 1246 | 13444 | ast Proposed import time: 455 | 1338 | ast import time: 457 | 1387 | ast import time: 476 | 1470 | ast import time: 459 | 1474 | ast import time: 493 | 1480 | ast import time: 499 | 1458 | ast import time: 448 | 1513 | ast import time: 492 | 1501 | ast import time: 487 | 1515 | ast import time: 602 | 1688 | ast Issue: gh-118761

Open Graph Description: Attempting @JelleZijlstra's suggestion in #118761 (comment). Running python -Ximporttime -Sc "import ast" ten times with the current and proposed modules, I get 14.1ms for the curren...

X Description: Attempting @JelleZijlstra's suggestion in #118761 (comment). Running python -Ximporttime -Sc "import ast" ten times with the current and proposed modules, I get 14.1ms fo...

Opengraph URL: https://github.com/python/cpython/pull/131953

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1629db7 Optimise import time for ast AA-Turner Mar 31, 2025 https://github.com/python/cpython/pull/131953/commits/1629db74705dc9ea1f941d50f0b9384d155e1fcf
dc95d19 fixup! Optimise import time for ast AA-Turner Mar 31, 2025 https://github.com/python/cpython/pull/131953/commits/dc95d19556bf741572286c9402265a4e6949219d
460491e Add private unparse names to getattr AA-Turner Apr 1, 2025 https://github.com/python/cpython/pull/131953/commits/460491e5d14510ad9fc59a8bbce5a1aa8a15e2b2
d88eb24 Define module level __dir__ AA-Turner Apr 1, 2025 https://github.com/python/cpython/pull/131953/commits/d88eb24b2e5c1e81ed393f604590304dfcc47002
a546328 Revert "Add private unparse names to getattr" AA-Turner Apr 1, 2025 https://github.com/python/cpython/pull/131953/commits/a5463286921a91a25ea7c9f9d72aa8fcde57f4e2
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