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v0.8.1
https://github.com/python/cpython
Revision 049039832da3d02592d680cebf71ab8a665a6564 authored by Antoine Pitrou on 10 June 2020, 20:37:21 UTC, committed by GitHub on 10 June 2020, 20:37:21 UTC


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:
https://github.com/python/cpython/commit/c1baa601e2b558deb690edfdf334fceee3b03327GH-commitcomment-39514438.
(cherry picked from commit 1642c0ef750f96664a98cadb09301d492098d2fb)

Co-authored-by: Daniel Fortunov <asqui@users.noreply.github.com>

Automerge-Triggered-By: @pitrou
1 parent 4b378ac
History
Tip revision: 049039832da3d02592d680cebf71ab8a665a6564 authored by Antoine Pitrou on 10 June 2020, 20:37:21 UTC
[3.7] bpo-40895: Update weakref documentation to remove old warnings (GH-20687) (GH-20793)
Tip revision: 0490398
File Mode Size
bdist_wininst
clinic
icons
layout
WinMain.c -rw-r--r-- 449 bytes
_msi.c -rw-r--r-- 32.5 KB
_testconsole.c -rw-r--r-- 3.3 KB
classicAppCompat.can.xml -rw-r--r-- 3.9 KB
classicAppCompat.cat -rw-r--r-- 10.7 KB
classicAppCompat.sccd -rw-r--r-- 18.1 KB
config.c -rw-r--r-- 5.3 KB
dl_nt.c -rw-r--r-- 4.6 KB
empty.c -rw-r--r-- 137 bytes
errmap.h -rw-r--r-- 4.9 KB
errmap.mak -rw-r--r-- 95 bytes
frozen_dllmain.c -rw-r--r-- 3.9 KB
getpathp.c -rw-r--r-- 32.6 KB
invalid_parameter_handler.c -rw-r--r-- 549 bytes
launcher.c -rw-r--r-- 59.6 KB
msvcrtmodule.c -rw-r--r-- 15.3 KB
pyconfig.h -rw-r--r-- 19.7 KB
pylauncher.rc -rw-r--r-- 1.5 KB
pyshellext.cpp -rw-r--r-- 18.3 KB
pyshellext.def -rw-r--r-- 141 bytes
pyshellext.idl -rw-r--r-- 277 bytes
pyshellext.rc -rw-r--r-- 1.1 KB
pyshellext_d.def -rw-r--r-- 143 bytes
python.manifest -rw-r--r-- 1.3 KB
python3.def -rw-r--r-- 40.5 KB
python3dll.c -rw-r--r-- 134 bytes
python_exe.rc -rw-r--r-- 1.2 KB
python_nt.rc -rw-r--r-- 1.2 KB
python_uwp.cpp -rw-r--r-- 5.3 KB
python_ver_rc.h -rw-r--r-- 970 bytes
pythonw_exe.rc -rw-r--r-- 1.2 KB
readme.txt -rw-r--r-- 3.5 KB
sqlite3.rc -rw-r--r-- 1.3 KB
store_info.txt -rw-r--r-- 5.6 KB
testpy.py -rw-r--r-- 831 bytes
validate_ucrtbase.py -rw-r--r-- 2.7 KB
winreg.c -rw-r--r-- 60.1 KB
winsound.c -rw-r--r-- 6.5 KB

readme.txt

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