Lesson 5: Lists & List Methods

1. What are Lists?

Lists are ordered, mutable (changeable) collections.

scores = [85, 92, 78, 95]
names = ["Alice", "Bob", "Charlie"]
mixed = [1, "hello", True, 3.14]

Access: scores[0] = 85, scores[-1] = 95

2. Common List Methods

• .append(item) — add to end
• .insert(index, item)
• .pop(index) — remove & return
• .remove(value) — remove first match
• .sort() / .reverse()
• .index(value) — find position
• .count(value) — how many times

Example:

nums = [3, 1, 4]
nums.append(2)      # [3,1,4,2]
nums.sort()         # [1,2,3,4]