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| author | Carl Meyer <carl@oddbird.net> | 2023-07-06 00:12:21 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2023-07-06 00:12:21 (GMT) |
| commit | 13aefd175e3c04529251f175c23cb3ed88451fd0 (patch) | |
| tree | df7cb6318fa1022d1e3dd93255780a117af47def | |
| parent | 104d7b760fed18055e4f04e5da3ca619e28bfc81 (diff) | |
| download | cpython-13aefd175e3c04529251f175c23cb3ed88451fd0.zip cpython-13aefd175e3c04529251f175c23cb3ed88451fd0.tar.gz cpython-13aefd175e3c04529251f175c23cb3ed88451fd0.tar.bz2 | |
gh-105256: What's New note for comprehension over locals() (#106378)
| -rw-r--r-- | Doc/whatsnew/3.12.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.12.rst b/Doc/whatsnew/3.12.rst index 1af80ea..a892f92 100644 --- a/Doc/whatsnew/3.12.rst +++ b/Doc/whatsnew/3.12.rst @@ -253,6 +253,12 @@ Inlining does result in a few visible behavior changes: * Calling :func:`locals` inside a comprehension now includes variables from outside the comprehension, and no longer includes the synthetic ``.0`` variable for the comprehension "argument". +* A comprehension iterating directly over ``locals()`` (e.g. ``[k for k in + locals()]``) may see "RuntimeError: dictionary changed size during iteration" + when run under tracing (e.g. code coverage measurement). This is the same + behavior already seen in e.g. ``for k in locals():``. To avoid the error, first + create a list of keys to iterate over: ``keys = list(locals()); [k for k in + keys]``. Contributed by Carl Meyer and Vladimir Matveev in :pep:`709`. |