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11.10. Glossary¶

dictionary¶: A collection of key-value pairs that maps from keys to values. The keys can be any immutable type, and the values can be any type.
key¶: A data item that is mapped to a value in a dictionary. Keys are used to look up values in a dictionary.
value¶: The value that is associated with each key in a dictionary.
key-value pair¶: One of the pairs of items in a dictionary. Values are looked up in a dictionary by key.
mapping type¶: A mapping type is a data type comprised of a collection of keys and associated values. Python’s only built-in mapping type is the dictionary. Dictionaries implement the associative array abstract data type.