What structure consists of key-value pairs enclosed in curly brackets?

• A. Lists
• B. Tuples
• C. Dictionaries
• D. Sets

Answer: (C)

The structure that consists of key-value pairs enclosed in curly brackets is a dictionary. In Python, a dictionary is a built-in data type that allows you to store and retrieve data in a highly efficient manner. Each key in a dictionary is unique, and it is associated with a value. This means that you can access values through their corresponding keys, making it easy to organize and retrieve complex data.

For example, a dictionary might look like this:

my_dict = {

"name": "Alice",

"age": 30,

"city": "New York"

}

In this example, "name," "age," and "city" are the keys, while "Alice," 30, and "New York" are the corresponding values. The ability to use keys to access values is what defines the functionality and purpose of a dictionary, making it a powerful component in Python for managing collections of data.

Lists, tuples, and sets do not use key-value pairs. Lists are ordered collections that allow for duplicate items, tuples are immutable ordered collections, and sets are unordered collections without duplicates. This fundamental distinction clearly identifies dictionaries as the correct answer.