List Methods

List methods are tools that change or inspect a list.

You call them with a dot after the list name.

Many of them change the list in place.

That means the shelf itself gets updated.

append and insert

append adds one item at the end.

insert puts an item at a chosen place.

extend and +

extend adds many items from another list.

+ can join two lists into a new list.

extend changes the first list. + builds a new one.

remove, pop, and clear

remove deletes the first matching value.

pop pulls out an item by index and returns it.

clear empties the whole list.

Finding items

index finds the place of a value.

count counts how many times a value appears.

Use in to ask if a value is there.

sort and reverse

sort puts items in order.

reverse flips the current order.

Both change the list itself.

copy a list

If you write b = a, both names point to the same shelf.

Use copy if you want a second shelf.

Tip: Remember which methods change the list and which return a new value.