Update documentation to describe None in ast.Interpolation

python · JelleZijlstra · Oct 23, 2025 · Sep 29, 2025 · Sep 29, 2025 · Sep 29, 2025
commit 5ab2512ac6ded9de5ded0566af29d04a1d99add2
diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst
@@ -363,6 +363,8 @@ Literals
      function call).
      This has the same meaning as ``FormattedValue.value``.
    * ``str`` is a constant containing the text of the interpolation expression.
+
+     If ``str`` is set to ``None``, then ``value`` is used to generate code when calling :func:`ast.unparse`. This no longer guarantees that the generated code is identical to the original and is intended for code generation.
    * ``conversion`` is an integer:
 
      * -1: no conversion