What is a dictionary in Python?

A dictionary in Python is a collection type that stores data as key-value pairs. It is an unordered collection, which means that the items do not have a defined order. Dictionaries are mutable, meaning they can be modified after their creation. Each key in a dictionary must be unique, and keys are typically strings or numbers, but they can be any immutable data type. Values, on the other hand, can be of any data type and can be repeated. Dictionaries are defined with curly braces (`{}`) with key-value pairs separated by commas, and a colon (`:`) is used to separate each key from its value.

Here are some operations and functionalities associated with a Python dictionary:

– Creating a Dictionary: You can create a dictionary by placing a comma-separated list of key-value pairs inside curly braces, or by using the `dict()` constructor.

– Accessing Values: Values are accessed by their keys using square brackets `[]`, or with the `get()` method.

– Adding and Modifying Items: You can add or modify items in a dictionary by assigning a value to a key. If the key doesn’t exist, it will be added to the dictionary; if it does, its value will be updated.

– Removing Items: Items can be removed using the `del` statement, or with the `pop()` method to remove an item by key, or `popitem()` to remove and return the last inserted key-value pair.

– **Iterating Over