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Diffstat (limited to 'Doc/reference/expressions.rst')
| -rw-r--r-- | Doc/reference/expressions.rst | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst index e060670..9761f21 100644 --- a/Doc/reference/expressions.rst +++ b/Doc/reference/expressions.rst @@ -65,7 +65,7 @@ atoms is: .. productionlist:: atom: `identifier` | `literal` | `enclosure` enclosure: `parenth_form` | `list_display` - : | `generator_expression` | `dict_display` + : | `generator_expression` | `dict_display` | `set_display` : | `string_conversion` | `yield_atom` @@ -281,6 +281,30 @@ datum (textually rightmost in the display) stored for a given key value prevails. +.. _set: + +Set displays +------------ + +.. index:: pair: set; display + object: set + +A set display is denoted by curly braces and distinguishable from dictionary +displays by the lack of colons separating keys and values: + +.. productionlist:: + set_display: "{" (`expression_list` | `comprehension`) "}" + +A set display yields a new mutable set object, the contents being specified by +either a sequence of expressions or a comprehension. When a comma-separated +list of expressions is supplied, its elements are evaluated from left to right +and added to the set object. When a comprehension is supplied, the set is +constructed from the elements resulting from the comprehension. + +An empty set cannot be constructed with ``{}``; this literal constructs an empty +dictionary. + + .. _string-conversions: String conversions |