commit a747cf6d9b87ea8c7ce3a42d09e5b966c8e83fa0
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Tue Feb 06 17:14:20 2018 -0800
committer Mariatta <Mariatta@users.noreply.github.com> Tue Feb 06 18:14:20 2018 -0700
tree 324c1a73b06e61ecac1300af805a97e4a0352a66
parent a702f6b44256817c28e7b3c6c4a99cb2af81151e

bpo-32720: Fixed the replacement field grammar documentation. (GH-5544) (GH-5546)

`arg_name` and `element_index` are defined as `digit`+ instead of `integer`.
(cherry picked from commit 7a561afd2c79f63a6008843b83733911d07f0119)

Co-authored-by: Mariatta <Mariatta@users.noreply.github.com>

Doc/library/string.rst

diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index 9b30f8f..ee8ea85 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -202,9 +202,9 @@
    .. productionlist:: sf
       replacement_field: "{" [`field_name`] ["!" `conversion`] [":" `format_spec`] "}"
       field_name: arg_name ("." `attribute_name` | "[" `element_index` "]")*
-      arg_name: [`identifier` | `integer`]
+      arg_name: [`identifier` | `digit`+]
       attribute_name: `identifier`
-      element_index: `integer` | `index_string`
+      element_index: `digit`+ | `index_string`
       index_string: <any source character except "]"> +
       conversion: "r" | "s" | "a"
       format_spec: <described in the next section>