why is the last element not included in python code example

Example 1: python last element in list

# To get the last element in a list you use -1 as position
bikes = ['trek', 'redline', 'giant']
bikes[-1]
# Output:
# 'giant'

Example 2: python get last element of list

mylist = [0, 1, 2]
mylist[-1] = 3 # sets last element
print(myList[-1]) # prints Last element