What is a List?

A list stores multiple values in one variable. Think of it like a shopping list!

Creating a List:

fruits = ["apple", "banana", "orange"]
numbers = [1, 2, 3, 4, 5]
mixed = ["Alice", 25, True, 3.14]

Accessing List Items

Lists use indexing (starting at 0):

fruits = ["apple", "banana", "orange"]

print(fruits[0])   # apple
print(fruits[1])   # banana
print(fruits[2])   # orange
print(fruits[-1])  # orange (last item)

Modifying Lists

fruits[0] = "mango"
print(fruits)
# ['mango', 'banana', 'orange']

fruits.append("grape")
print(fruits)
# [..., "grape"]

fruits.remove("banana")
print(fruits)
# ["apple", "orange"]

fruits = ["apple", "banana"]
print(len(fruits))
# 2

What is a Dictionary?

A dictionary stores data with labels (called keys). Instead of positions, you use meaningful names!

Creating a Dictionary:

student = {
    "name": "Alice",
    "age": 20,
    "major": "Computer Science"
}

Accessing Dictionary Items

student = {"name": "Alice", "age": 20}

print(student["name"])   # Alice
print(student["age"])    # 20

Modifying Dictionaries

student = {"name": "Alice", "age": 20}

# Change a value
student["age"] = 21

# Add a new key
student["city"] = "New York"

# Remove a key
del student["city"]

print(student)

Output:

{'name': 'Alice', 'age': 21}

Real-World Example: Student Database

# List of dictionaries
students = [
    {"name": "Alice", "grade": "A"},
    {"name": "Bob", "grade": "B"},
    {"name": "Charlie", "grade": "A"}
]

# Access data
for student in students:
    print(student["name"], "got grade", student["grade"])

Output:

Alice got grade A
Bob got grade B
Charlie got grade A

✅ Quick Quiz

🎯 Challenge - Create a Contact List

Write a program that:

1. Creates a dictionary for 3 contacts (name, phone, email)
2. Stores them in a list
3. Loops through the list and prints each contact's info

Expected output format:
"Name: Alice, Phone: 555-1234, Email: alice@email.com"

🎉 Congratulations! 🎉

You've completed the Python tutorial! You now know:

• ✅ Variables and Data Types
• ✅ Math and Operations
• ✅ Making Decisions (If/Else)
• ✅ Loops and Iteration
• ✅ Functions and Reusable Code
• ✅ Lists and Dictionaries

Next step: Build your own projects and keep practicing! 🚀