Lists are one of Python’s most useful data structures. They allow you to store multiple items in a single variable and keep them organized in a specific order.
Creating Lists
Create a list by placing items inside square brackets, separated by commas:
fruits = ["apple", "banana", "orange"]
numbers = [1, 2, 3, 4, 5]
mixed = ["hello", 42, True, 3.14]Accessing List Items
Use index numbers to access specific items. Python starts counting from 0:
print(fruits[0]) # "apple"
print(fruits[1]) # "banana"
print(fruits[-1]) # "orange" (last item)Modifying Lists
Lists are mutable, meaning you can change them after creation:
# Add items
fruits.append("grape")
fruits.insert(1, "kiwi")
# Remove items
fruits.remove("banana")
last_fruit = fruits.pop()
# Change items
fruits[0] = "pineapple"Useful List Methods
numbers = [3, 1, 4, 1, 5]
print(len(numbers)) # 5 (length)
print(numbers.count(1)) # 2 (occurrences of 1)
numbers.sort() # [1, 1, 3, 4, 5]
numbers.reverse() # [5, 4, 3, 1, 1]Lists are perfect for storing related data like shopping lists, student names, or game scores.
