📋 Lists

A list

fruits = ["apple", "banana", "cherry"]
print(fruits[0])   # apple
print(fruits[-1])  # cherry
print(len(fruits)) # 3

Indexes start at 0. -1 is the last item.

Changing a list

Looping over a list

scores = [88, 92, 79, 95]
for s in scores:
    print(s)
print("Average:", sum(scores) / len(scores))
print("Best:", max(scores))

Building a list

names = []
for i in range(3):
    names.append(input("A name: "))
print(names)

Tip

💡 IndexError: list index out of range means you asked for an item that doesn’t exist — like fruits[3] in a list of 3.

🧠 Quick quiz

Answer all 4 questions correctly to mark this lesson as done.