CODE EXAMPLE FOR PYTHON

index of and last index of in python

# To get first and last index of list or string
list_a = [1,2,3,4]
first_index = list_a[0] # 1
last_index = list_a[-1] # 4
str_a = "abc"
first_index_str = str_a[0] # a
last_index_str = str_a[-1] # c

# To find first and last index of char in string
str_b = "abcabcdec"
first_index_of_c = str_b.index("c") # 2
last_index_of_c = str_b.rindex("c") # 8