[3.9] bpo-40895: Update weakref documentation to remove old warnings (GH-20687)#20791
Merged
miss-islington merged 1 commit intopython:3.9from Jun 10, 2020
Merged
Conversation
…nGH-20687) The doccumentation at https://docs.python.org/3.10/library/weakref.html cautions that the `WeakKeyDictionary` and `WeakValueDictionary` are susceptible to the problem of dictionary mutation during iteration. These notes present the user with a problem that has no easy solution. I dug into the implementation and found that fortunately, Antoine Pitrou already addressed this challenge (10 years ago!) by introducing an `_IterationGuard` context manager to the implementation, which delays mutation while an iteration is in progress. I asked for confirmation and @pitrou agreed that these notes could be removed: python@c1baa601e2b558deb690edfdf334fceee3b03327GH-commitcomment-39514438 (cherry picked from commit 1642c0e) Co-authored-by: Daniel Fortunov <[email protected]>
pitrou
approved these changes
Jun 10, 2020
Contributor
Author
|
@asqui: Status check is done, and it's a success ✅ . |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
5 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
The doccumentation at https://docs.python.org/3.10/library/weakref.html cautions that the
WeakKeyDictionaryandWeakValueDictionaryare susceptible to the problem of dictionary mutation during iteration.These notes present the user with a problem that has no easy solution.
I dug into the implementation and found that fortunately, Antoine Pitrou already addressed this challenge (10 years ago!) by introducing an
_IterationGuardcontext manager to the implementation, which delays mutation while an iteration is in progress.I asked for confirmation and @pitrou agreed that these notes could be removed:
c1baa601e2b558deb690edfdf334fceee3b03327GH-commitcomment-39514438
(cherry picked from commit 1642c0e)
Co-authored-by: Daniel Fortunov [email protected]
https://bugs.python.org/issue40895