Skip to content

gh-117865: Defer import of re in ast - #119546

Merged
JelleZijlstra merged 2 commits into
python:mainfrom
JelleZijlstra:ast-re
May 28, 2024
Merged

gh-117865: Defer import of re in ast#119546
JelleZijlstra merged 2 commits into
python:mainfrom
JelleZijlstra:ast-re

Conversation

@JelleZijlstra

@JelleZijlstraJelleZijlstra commented May 25, 2024•
edited by bedevere-app Bot
Loading

Copy link
Copy Markdown
Member

@JelleZijlstra
pythongh-117865: Defer import of re in ast
9cbb64c
This is used only by ast.get_source_segment(), so it seems sensible to avoid importing it.
@bedevere-appbedevere-appBot mentioned this pull request May 25, 2024
Open
@AlexWaygood

AlexWaygood commented May 25, 2024

Copy link
Copy Markdown
Member

How much does this speedup the import of inspect? I wouldn't expect it to do much on its own, since inspect itself also imports re. Or is the idea that this could be done in combination with some of the changes in #119526?

@AlexWaygood

AlexWaygood commented May 25, 2024

Copy link
Copy Markdown
Member

(Though it's probably worth doing even if it just speeds up the import of ast. I guess I was looking at it through the lens of the github issue it was attached to.)

AlexWaygood
AlexWaygood approved these changes May 25, 2024
View reviewed changes

@AlexWaygoodAlexWaygood left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Locally for me this cuts about 20% off the import time for ast (0.0036s -> 0.0029s), so this seems worth doing. This is especially true since the _splitlines_no_ff function is only ever used in get_source_segment, which is one of the lesser-used ast-module APIs

Comment threadLib/ast.py
@JelleZijlstra@AlexWaygood
Update Lib/ast.py
967f7d9
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
@JelleZijlstra
JelleZijlstra merged commit ae11d68 into python:mainMay 28, 2024
@JelleZijlstra
JelleZijlstra deleted the ast-re branch May 28, 2024 18:04
estyxx pushed a commit to estyxx/cpython that referenced this pull request Jul 17, 2024
@JelleZijlstra@AlexWaygood@estyxx
pythongh-117865: Defer import of re in ast (python#119546)
75e2276
This is used only by ast.get_source_segment(), so it seems sensible to avoid importing it.
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

@AlexWaygoodAlexWaygoodAlexWaygood approved these changes
@isidenticalisidenticalAwaiting requested review from isidenticalisidentical is a code owner

Assignees

No one assigned

Labels

None yet

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

2 participants

@JelleZijlstra@AlexWaygood