python last item on a list O(1) code example

Example: python get last element of list

number_list = [1, 2, 3]
print(number_list[-1]) #Gives 3

number_list[-1] = 5 # Set the last element
print(number_list[-1]) #Gives 5

number_list[-2] = 3 # Set the second to last element
number_list
[1, 3, 5]