An index of -1 identifies the last element in a list. code example

Example 1: how to find last index of list in python

# Use an Index of -1
l = [1,2,3,4]
print(l[-1])
# Returns 4

Example 2: last index in python

# using rindex() 
test_string = "abcabcabc"
# using rindex() 
# to get last element occurrence 
res = test_string.rindex('c')  
# printing result 
print ("The index of last element occurrence: " + str(res))

OUTPUT:
  The index of last element occurrence: 8