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[3.9] bpo-42086: Document AST operator nodes acts as a singleton (GH-22896) #22897

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Nov 13, 2020
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[3.9] bpo-42086: Document AST operator nodes acts as a singleton (GH-22896) #22897

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7 changes: 7 additions & 0 deletions Doc/library/ast.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -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
------------------
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