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Revision 972aba86ede0bf254e16a760639a1ff8df298578 authored by Antoine Pitrou on 10 June 2020, 20:38:42 UTC, committed by GitHub on 10 June 2020, 20:38:42 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 c7a6c7b
Tip revision: 972aba86ede0bf254e16a760639a1ff8df298578 authored by Antoine Pitrou on 10 June 2020, 20:38:42 UTC
[3.8] bpo-40895: Update weakref documentation to remove old warnings (GH-20687) (GH-20792)
[3.8] bpo-40895: Update weakref documentation to remove old warnings (GH-20687) (GH-20792)
Tip revision: 972aba8
rangeobject.h
/* Range object interface */
#ifndef Py_RANGEOBJECT_H
#define Py_RANGEOBJECT_H
#ifdef __cplusplus
extern "C" {
#endif
/*
A range object represents an integer range. This is an immutable object;
a range cannot change its value after creation.
Range objects behave like the corresponding tuple objects except that
they are represented by a start, stop, and step datamembers.
*/
PyAPI_DATA(PyTypeObject) PyRange_Type;
PyAPI_DATA(PyTypeObject) PyRangeIter_Type;
PyAPI_DATA(PyTypeObject) PyLongRangeIter_Type;
#define PyRange_Check(op) (Py_TYPE(op) == &PyRange_Type)
#ifdef __cplusplus
}
#endif
#endif /* !Py_RANGEOBJECT_H */
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