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In Python, a dictionary is a built-in data type that stores a collection of key-value pairs. It is also sometimes referred to as an associative array or a hash map in other programming languages. Dictionaries are used to map keys to corresponding values, allowing you to quickly retrieve values based on their associated keys.

Key characteristics of dictionaries in Python:

Unordered: Dictionaries are unordered collections, meaning the order of items is not preserved. Starting from Python 3.7, the insertion order of items is retained, but you should not rely on this behavior in earlier versions of Python.

Mutable: Dictionaries are mutable, which means you can add, modify, and remove key-value pairs after the dictionary is created.

Keys must be unique and hashable: Each key in a dictionary must be unique, and they must be of a hashable data type (typically immutable types like strings, numbers, or tuples containing only hashable elements).

Values can be of any type: The values associated with keys can be of any data type, including other dictionaries, lists, tuples, numbers, strings, or even custom objects.

Dictionaries are widely used in Python for tasks that involve mapping keys to values, such as storing configuration settings, building data structures, and more. They provide fast and efficient lookups for retrieving values based on their keys.

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