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Diffstat (limited to 'Doc/library/string.rst')
| -rw-r--r-- | Doc/library/string.rst | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Doc/library/string.rst b/Doc/library/string.rst index 2a46a35..8098651 100644 --- a/Doc/library/string.rst +++ b/Doc/library/string.rst @@ -194,7 +194,7 @@ literal text, it can be escaped by doubling: ``{{`` and ``}}``. The grammar for a replacement field is as follows: .. productionlist:: sf - replacement_field: "{" `field_name` ["!" `conversion`] [":" `format_spec`] "}" + replacement_field: "{" [`field_name`] ["!" `conversion`] [":" `format_spec`] "}" field_name: arg_name ("." `attribute_name` | "[" `element_index` "]")* arg_name: (`identifier` | `integer`)? attribute_name: `identifier` @@ -202,7 +202,7 @@ The grammar for a replacement field is as follows: conversion: "r" | "s" | "a" format_spec: <described in the next section> -In less formal terms, the replacement field starts with a *field_name* that specifies +In less formal terms, the replacement field can start with a *field_name* that specifies the object whose value is to be formatted and inserted into the output instead of the replacement field. The *field_name* is optionally followed by a *conversion* field, which is @@ -223,7 +223,7 @@ Some simple format string examples:: "First, thou shalt count to {0}" # References first positional argument "Bring me a {}" # Implicitly references the first positional argument - "From {} to {}" # Same as "From {0] to {1}" + "From {} to {}" # Same as "From {0} to {1}" "My quest is {name}" # References keyword argument 'name' "Weight in tons {0.weight}" # 'weight' attribute of first positional arg "Units destroyed: {players[0]}" # First element of keyword argument 'players'. @@ -243,6 +243,7 @@ Some examples:: "Harold's a clever {0!s}" # Calls str() on the argument first "Bring out the holy {name!r}" # Calls repr() on the argument first + "More {!a}" # Calls ascii() on the argument first The *format_spec* field contains a specification of how the value should be presented, including such details as field width, alignment, padding, decimal |