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Title: [3.9] bpo-40895: Update weakref documentation to remove old warnings (GH-20687) by miss-islington · Pull Request #20791 · python/cpython · GitHub

Open Graph Title: [3.9] bpo-40895: Update weakref documentation to remove old warnings (GH-20687) by miss-islington · Pull Request #20791 · python/cpython

X Title: [3.9] bpo-40895: Update weakref documentation to remove old warnings (GH-20687) by miss-islington · Pull Request #20791 · python/cpython

Description: 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: c1baa601e2b558deb690edfdf334fceee3b03327GH-commitcomment-39514438 (cherry picked from commit 1642c0e) Co-authored-by: Daniel Fortunov asqui@users.noreply.github.com https://bugs.python.org/issue40895

Open Graph Description: 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 iter...

X Description: 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 iter...

Opengraph URL: https://github.com/python/cpython/pull/20791

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