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Use designated syntax for optional grammar element.

This commit is contained in:
Georg Brandl 2010-06-27 10:49:23 +00:00
parent 565569b8dc
commit 817d91829f
1 changed files with 1 additions and 1 deletions
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Doc/library/string.rst
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@ -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 "]"> +