list1 = [1,2,3,4,5,6]

print(id(list1))

list1.insert(2, 1000)   # insert item 1000 at index 2

print(list1)            # now the last valid index is 6

list1.insert(6, 4000)   # insert the item 4000 at index 6

print(list1) 	 	# now the last valid index is 7

list1.insert(8, 8000)   # insert the item 8000 at index 8, which is beyond the last valid index

print(list1)

print(list1[8])