Use designated syntax for optional grammar element.

817d9182 · Georg Brandl · 565569b8 · 817d9182
Commit 817d9182 authored Jun 27, 2010 by Georg Brandl
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Doc/library/string.rst Doc/library/string.rst +1 -1

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--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -224,7 +224,7 @@ The grammar for a replacement field is as follows:
   .. productionlist:: sf
      replacement_field: "{" [`field_name`] ["!" `conversion`] [":" `format_spec`] "}"
      field_name: arg_name ("." `attribute_name` | "[" `element_index` "]")*
-      arg_name: (`identifier` | `integer`)?
+      arg_name: [`identifier` | `integer`]
      attribute_name: `identifier`
      element_index: `integer` | `index_string`
      index_string: <any source character except "]"> +