Dictionaries

1What is a Dictionary?✨

A dictionary in Python is a collection of key-value pairs. It allows you to store data in a way that makes it easy to look up information using a unique key. This is similar to a real dictionary where you find a word (key) and get its meaning (value).

2Why Use Dictionaries?🎯

• ✓ Fast data retrieval
• ✓ Flexible and dynamic
• ✓ Ideal for storing related data
• ✓ Supports various data types as values

3Creating a Dictionary💡

You can create a dictionary by placing key-value pairs inside curly braces. Here’s how:

my_dict = {
    "name": "Alice",
    "age": 12,
    "city": "Delhi"
}

This dictionary stores a person's name, age, and city.

4Accessing Values🚀

To get a value from a dictionary, use its key. Here’s an example:

print(my_dict["name"])

This will display "Alice" on the screen.

5Modifying a Dictionary🔍

You can easily add or change values in a dictionary using keys. For example:

my_dict["age"] = 13
my_dict["hobby"] = "reading"

Now, the age is updated, and a new key-value pair for hobby is added.

6Looping Through a Dictionary⭐

You can loop through a dictionary to access keys and values. Here’s how:

for key, value in my_dict.items():
    print(key, ":", value)

This will print each key along with its corresponding value.

7What You'll Build This Grade🧩

• ✓ Programs that store and manage user data
• ✓ Interactive quizzes with questions and answers
• ✓ Games that use scores and player information
• ✓ Applications that require organized data storage