Web Reference: Jul 12, 2025 · The task of creating a dictionary in Python involves storing key-value pairs in a structured and efficient manner, enabling quick lookups and modifications. A dictionary is an unordered, mutable data structure where each key must be unique and immutable, while values can be of any data type. Dictionary Dictionaries are used to store data values in key:value pairs. A dictionary is a collection which is ordered*, changeable and do not allow duplicates. As of Python version 3.7, dictionaries are ordered. In Python 3.6 and earlier, dictionaries are unordered. Dictionaries are written with curly brackets, and have keys and values: In this tutorial, you’ll explore how to create dictionaries using literals and the dict() constructor, as well as how to use Python’s operators and built-in functions to manipulate them. By learning about Python dictionaries, you’ll be able to access values through key lookups and modify dictionary content using various methods.
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