From bc777047833256bc6b10b2c7b46cce9e9e6f956c Mon Sep 17 00:00:00 2001 From: "Miss Islington (bot)" <31488909+miss-islington@users.noreply.github.com> Date: Fri, 13 Nov 2020 01:05:41 -0800 Subject: [PATCH] [3.9] bpo-42086: Document AST operator nodes acts as a singleton (GH-22896) (GH-22897) Automerge-Triggered-By: GH:gvanrossum (cherry picked from commit b37c994e5ac73268abe23c52005b80cdca099793) Co-authored-by: Batuhan Taskaya --- Doc/library/ast.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst index 932f7258f9d..95cb017d145 100644 --- a/Doc/library/ast.rst +++ b/Doc/library/ast.rst @@ -1503,6 +1503,13 @@ Async and await fields as :class:`For` and :class:`With`, respectively. Only valid in the body of an :class:`AsyncFunctionDef`. +.. note:: + When a string is parsed by :func:`ast.parse`, operator nodes (subclasses + of :class:`ast.operator`, :class:`ast.unaryop`, :class:`ast.cmpop`, + :class:`ast.boolop` and :class:`ast.expr_context`) on the returned tree + will be singletons. Changes to one will be reflected in all other + occurrences of the same value (e.g. :class:`ast.Add`). + :mod:`ast` Helpers ------------------