Lists

Lists are ordered, mutable collections. They can hold mixed types and be resized as needed.

Creating Lists

numbers = [1, 2, 3]
mixed = ["Apple", 12, 45.7, False]
nested = ["Apple", ["Banana", "Cherry"], "Durian"]

Accessing Items

fruits = ["Apple", "Banana", "Cherry"]

print(fruits[0])   # Apple
print(fruits[-1])  # Cherry

Slicing

letters = ["P", "y", "t", "h", "o", "n"]
print(letters[2:5])  # ['t', 'h', 'o']
print(letters[:3])   # ['P', 'y', 't']
print(letters[3:])   # ['h', 'o', 'n']

Updating Items

odd = [2, 4, 6, 8]
odd[0] = 1
odd[1:4] = [3, 5, 7]
print(odd)  # [1, 3, 5, 7]

Adding Items

fruits = ["Apple", "Banana"]
fruits.append("Cherry")
fruits.extend(["Durian", "Mango"])
fruits.insert(1, "Grape")

Removing Items

fruits = ["Apple", "Banana", "Cherry", "Durian"]
fruits.remove("Banana")
last = fruits.pop()
del fruits[0]
fruits.clear()

Common Methods

Method	Purpose
append()	add one item to end
extend()	add many items
insert()	insert at index
remove()	remove by value
pop()	remove by index (default last)
clear()	remove all items
index()	find first index
count()	count occurrences
sort()	sort list in place
reverse()	reverse in place
copy()	shallow copy

List Comprehensions

powers = [2 ** x for x in range(5)]
odds = [x for x in range(10) if x % 2 == 1]

Iteration

for fruit in ["Apple", "Banana"]:
    print(fruit)

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