[issue35585] Speedup Enum lookup

[Andrew Svetlov]

Change by Andrew Svetlov :


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue35585] Speedup Enum lookup

[Andrew Svetlov]

Andrew Svetlov  added the comment:


New changeset 705b5998035739b1794a862123d3dc6e339a14d0 by Andrew Svetlov (Miss 
Islington (bot)) in branch '3.7':
Speed-up building enums by value, e.g. http.HTTPStatus(200) (GH-11318) 
(GH-11324)
https://github.com/python/cpython/commit/705b5998035739b1794a862123d3dc6e339a14d0


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[issue35585] Speedup Enum lookup

[miss-islington]

Change by miss-islington :


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pull_requests: +10587

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[issue35585] Speedup Enum lookup

[Ethan Furman]

Ethan Furman  added the comment:


New changeset 34ae04f74dcf4ac97d07c3e82eaf8f619d80cedb by Ethan Furman (Andrew 
Svetlov) in branch 'master':
Speed-up building enums by value, e.g. http.HTTPStatus(200) (#11318)
https://github.com/python/cpython/commit/34ae04f74dcf4ac97d07c3e82eaf8f619d80cedb


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[issue35585] Speedup Enum lookup

[Raymond Hettinger]

Change by Raymond Hettinger :


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assignee:  -> ethan.furman
nosy: +ethan.furman

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[issue35585] Speedup Enum lookup

[Andrew Svetlov]

Change by Andrew Svetlov :


--
keywords: +patch
pull_requests: +10568
stage:  -> patch review

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[issue35585] Speedup Enum lookup

[Andrew Svetlov]

Change by Andrew Svetlov :


--
keywords: +patch, patch
pull_requests: +10568, 10569
stage:  -> patch review

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[issue35585] Speedup Enum lookup

[Andrew Svetlov]

New submission from Andrew Svetlov :

Construction enums by-value (e.g. http.HTTPStatus(200)) performs two dict 
lookups: 
if value in cls._value2member_map_:
return cls._value2member_map_[value]

Changing the code to just
return cls._value2member_map_[value]
with catching KeyError can speedup the fast path a little.

--
components: Library (Lib)
messages: 332524
nosy: asvetlov
priority: normal
severity: normal
status: open
title: Speedup Enum lookup
versions: Python 3.7, Python 3.8

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