Day 7: Python Lists

1 What Are Lists? 🎒

💡Learn: Lists store multiple items!

# Creating lists
fruits = ["apple", "banana", "orange"]
print("Fruits:", fruits)

numbers = [10, 20, 30]
print("Numbers:", numbers)

✨Tip: Use [ ] and commas!

2 Accessing Items 🔍

📍Learn: Get items by index!

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

print("First:", fruits[0])
print("Second:", fruits[1])
print("Last:", fruits[-1])

print("---")

for fruit in fruits:
    print("I like", fruit)

🔑Remember: Start at 0!

3 List Methods 🛠️

🎯Learn: Add and remove items!

todo = ["homework"]
print("Start:", todo)

todo.append("read")
print("After append:", todo)

todo.remove("homework")
print("After remove:", todo)

print("Length:", len(todo))

💡Tip: Methods change lists!

4 Checking Lists 🔎

🎯Learn: Check if items exist!

fruits = ["apple", "banana"]

if "banana" in fruits:
    print("✅ Have bananas!")

if "grape" in fruits:
    print("✅ Have grapes!")
else:
    print("❌ No grapes")

🎯Use: in keyword!

5 Slicing 🍕

✂️Learn: Get parts of lists!

numbers = [0, 1, 2, 3, 4, 5]

print("First 3:", numbers[0:3])
print("Last 2:", numbers[-2:])
print("Every 2nd:", numbers[::2])

📐Format: [start:end:step]

6 Shopping List! 🛒

🛍️Build: Shopping app!

shopping = []

item1 = input("Item 1: ")
shopping.append(item1)

item2 = input("Item 2: ")
shopping.append(item2)

print("---")
print("List:", shopping)
print("Total:", len(shopping))

print("---")
remove = input("Remove: ")

if remove in shopping:
    shopping.remove(remove)
    print("✅ Removed!")

print("Final:", shopping)

🎯Try: milk, eggs!

7 High Scores! 🏆

🎮Final: Score tracker!

scores = []

for i in range(3):
    s = input("Score: ")
    s = int(s)
    scores.append(s)

print("---")
print("All:", scores)

scores.sort()
scores.reverse()

print("Top:", scores[0])
print("Low:", scores[-1])

avg = sum(scores) / len(scores)
print("Avg:", round(avg, 1))

if scores[0] >= 90:
    print("🌟 AMAZING!")
else:
    print("⭐ GOOD!")

🎯Try: 95, 82, 88!

📋 Python Lists - Day 7

1 What Are Lists? 🎒

2 Accessing Items 🔍

3 List Methods 🛠️

4 Checking Lists 🔎

5 Slicing 🍕

6 Shopping List! 🛒

7 High Scores! 🏆

🎉 List Expert! 🎉