python add to back of list code example

Example: how to insert an element to the end of the list using insert in python

Syntax : list(index, item)

>>> numbers = [1, 2, 3]
>>> numbers
[1, 2, 3]
>>> numbers.insert(len(numbers), 4) #len(list) as index to insert item at the end of list
>>> numbers
[1, 2, 3, 4]
>>> numbers.insert(4, 5)
>>> numbers
[1, 2, 3, 4, 5]
>>> len(numbers)
5
>>> numbers[4] # last index always will be len(list) - 1. Because index starts at 0.
5
>>> numbers[5] # Throws error since index no 4 is the last index with element 5.
Traceback (most recent call last):
  File "<pyshell#8>", line 1, in <module>
    numbers[5]
IndexError: list index out of range