Data Structures

List Methods

Method	What it does
`append(x)`	Add `x` to the end
`insert(i, x)`	Insert `x` at position `i`
`extend(list)`	Add every item of another list
`remove(x)`	Remove the first `x`
`pop()` / `pop(i)`	Remove and return the last item / item `i`
`index(x)`	Position of `x`
`count(x)`	How many times `x` appears
`sort()`	Sort in place
`reverse()`	Reverse in place
`copy()`	A shallow copy

marks = [72, 85, 64]
marks.append(91)
marks.sort()
print(marks)                 # [64, 72, 85, 91]
print(sorted(marks, reverse=True))  # [91, 85, 72, 64]
print(sum(marks) / len(marks))      # 78.0