From 8ce57642d06165157db60ee2e0542ff2a0f5efd9 Mon Sep 17 00:00:00 2001
From: Dima Burmistrov <pyctrl.dev@gmail.com>
Date: Sat, 19 Apr 2025 21:08:08 +0400
Subject: [PATCH] Update "Format String Syntax" documentation block to match
 actual behaviour

From discussion thread:
https://discuss.python.org/t/format-string-syntax-specification-differs-from-actual-behaviour/46716/2
---
 Doc/library/string.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index 5e2f35497cbe86..af156764642dd4 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -216,8 +216,8 @@ The grammar for a replacement field is as follows:
 .. productionlist:: format-string
    replacement_field: "{" [`field_name`] ["!" `conversion`] [":" `format_spec`] "}"
    field_name: `arg_name` ("." `attribute_name` | "[" `element_index` "]")*
-   arg_name: [`~python-grammar:identifier` | `~python-grammar:digit`+]
-   attribute_name: `~python-grammar:identifier`
+   arg_name: [`~python-grammar:digit`+ | `attribute_name`]
+   attribute_name: <any source character except "]" or "."> +
    element_index: `~python-grammar:digit`+ | `index_string`
    index_string: <any source character except "]"> +
    conversion: "r" | "s" | "a"