[3.12] GH-95088: Clarify rules for parsing an item key for format strings (GH-103779) (#105419)

miss-islington · achhina · ambv · web-flow · commit ca4649a764ba · 2023-06-06T20:56:16.000-07:00
GH-95088: Clarify rules for parsing an item key for format strings (GH-103779) (cherry picked from commit 3e7316d) Co-authored-by: achhina <amanschhina@gmail.com> Co-authored-by: Łukasz Langa <lukasz@langa.pl> Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
@@ -227,7 +227,9 @@ See also the :ref:`formatspec` section.
 
 The *field_name* itself begins with an *arg_name* that is either a number or a
 keyword.  If it's a number, it refers to a positional argument, and if it's a keyword,
-it refers to a named keyword argument.  If the numerical arg_names in a format string
+it refers to a named keyword argument. An *arg_name* is treated as a number if
+a call to :meth:`str.isdecimal` on the string would return true.
+If the numerical arg_names in a format string
 are 0, 1, 2, ... in sequence, they can all be omitted (not just some)
 and the numbers 0, 1, 2, ... will be automatically inserted in that order.
 Because *arg_name* is not quote-delimited, it is not possible to specify arbitrary
