[3.7] bpo-40895: Update weakref documentation to remove old warnings (GH-20687)#20793
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miss-islington merged 1 commit intopython:3.7from Jun 10, 2020
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…ythonGH-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]>
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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
Automerge-Triggered-By: @pitrou