Lists are ordered groups of items. Lists automatically change in size as items are put in and removed.

len()

.pop()

.extend(other_list)

.index(elem)

.append()

.remove(elem)

+ or +=

.insert(index, elem)

Creating a list: start and end with brackets, items in the list are separated by commas

• List_1 = [1, 2, 3, 4]

A list with one element is not the same thing as that element.

• [1] ≠ 1

Elements of a list are indexed, starting from 0.

• letters = [’a’, ‘b’, ‘c’, ‘d’]
  • ‘a’ has index 0, ‘b’ has index 1, ‘c’ has index 2, ‘d’ has index 3

List elements can be accessed individually. Negative indexing works too.

• letters = [’a’, ‘b’, ‘c’, ‘d’]
  • letters[1] is ‘b’
  • letters[-1] is ‘d’

List elements can be changed individually.

• letters = [’a’, ‘b’, ‘c’, ‘d’]
• letters[0] = ‘x’
• letters = [’x’, ‘b’, ‘c’, ‘d’]

Can iterate through a whole list