Python List Methods

📋 Working with Lists

Lists are ordered collections that can store multiple items. Python provides many built-in methods to work with lists efficiently.


# Basic list operations
fruits = ["apple", "banana"]
fruits.append("orange")    # Add item
print(fruits)              # ['apple', 'banana', 'orange']

15+

List Methods

Mutable

Can Change

Ordered

Has Index

List Method Categories

➕

Adding Items

Add new elements to your list

append() insert() extend()

➖

Removing Items

Delete elements from your list

remove() pop() clear()

🔍

Finding Items

Search and locate elements

index() count()

🔄

Organizing Items

Sort and arrange your list

sort() reverse() copy()

🔹 Adding Items to Lists

append() - Add One Item

Adds a single item to the end of the list


colors = ["red", "blue"]
colors.append("green")
print(colors)  # ['red', 'blue', 'green']

insert() - Add at Specific Position

Adds an item at a specific index


numbers = [1, 3, 4]
numbers.insert(1, 2)  # Insert 2 at index 1
print(numbers)  # [1, 2, 3, 4]

extend() - Add Multiple Items

Adds all items from another list


pets = ["cat", "dog"]
more_pets = ["fish", "bird"]
pets.extend(more_pets)
print(pets)  # ['cat', 'dog', 'fish', 'bird']

🔹 Removing Items from Lists

remove() - Remove by Value

Removes the first occurrence of a value


fruits = ["apple", "banana", "apple"]
fruits.remove("apple")  # Removes first "apple"
print(fruits)  # ['banana', 'apple']

pop() - Remove by Index

Removes and returns item at index (last item if no index)


items = ["a", "b", "c"]
last = items.pop()      # Remove last item
print(last)             # 'c'
print(items)            # ['a', 'b']

first = items.pop(0)    # Remove first item
print(first)            # 'a'
print(items)            # ['b']

clear() - Remove All Items

Removes all items from the list


numbers = [1, 2, 3, 4, 5]
numbers.clear()
print(numbers)  # []

🔹 Finding Items in Lists

index() - Find Position

Returns the index of the first occurrence


colors = ["red", "blue", "green"]
position = colors.index("blue")
print(position)  # 1

count() - Count Occurrences

Returns how many times a value appears


numbers = [1, 2, 2, 3, 2]
count = numbers.count(2)
print(count)  # 3

🔹 Organizing Lists

sort() - Sort in Place

Sorts the list permanently


numbers = [3, 1, 4, 2]
numbers.sort()
print(numbers)  # [1, 2, 3, 4]

# Sort in reverse
numbers.sort(reverse=True)
print(numbers)  # [4, 3, 2, 1]

reverse() - Reverse Order

Reverses the order of items


letters = ["a", "b", "c"]
letters.reverse()
print(letters)  # ['c', 'b', 'a']

copy() - Make a Copy

Creates a shallow copy of the list


original = [1, 2, 3]
backup = original.copy()
original.append(4)
print(original)  # [1, 2, 3, 4]
print(backup)    # [1, 2, 3]