List methods

Learn append, extend, insert, pop, remove methods.

List methods

Common list methods: append adds to the end, insert adds at an index, remove removes an item, pop removes the last item.

cart = ["Apple"]
cart.append("Bread")   # ['Apple', 'Bread']
cart.insert(0, "Milk")  # ['Milk', 'Apple', 'Bread']
cart.remove("Apple")    # ['Milk', 'Bread']
cart.pop()             # ['Milk']

These methods modify the list in place; they do not return a new list.

pop and len

pop removes and returns the last item. len gives the list length:

cart = ["Apple", "Bread", "Milk"]
last = cart.pop()  # 'Milk', cart: ['Apple', 'Bread']
n = len(cart)      # 2

pop can take an index too: cart.pop(0) removes the first item. len gives 0 for an empty list.

Exercise Modify with methods

Assign cart = ["Apple"]. Add cart.append("Bread"). Add cart.insert(0, "Milk"). Print print(cart).

Show example solution

cart = ["Apple"]
cart.append("Bread")
cart.insert(0, "Milk")
print(cart)

Test yourself

What does cart.insert(0, "Milk") do?
- Removes Milk from the cart
- Adds Milk at the start
- Empties the cart
- Finds Milk
Show answer

Adds Milk at the start — insert(0, ...) adds the item at the start (index 0).

Complete the remove call

cart = ["Apple", "Bread"]
cart.____("Apple")

Show answer

cart = ["Apple", "Bread"]
cart.remove("Apple")

Match the methods

append

Add to end
insert

Add at index
remove

Remove item
pop

Remove last

Next lesson: in and count

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