Returns the index of the last occurrence of the string searched for (raises ValueError if not found).

str. index(sub[, start[, end]])

sub

Required. The string searched for.

start

Optional. Search start position.

end

Optional. Search end position.

int

#TODO

>>> "ABAB".index("B")
1
>>> "ABAB".index("B", 2, 4)
3
>>> "ABAB".index("B", 2)
3
>>> "ABAB".index("C")
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
ValueError: substring not found

find()

rfind()

`index()`_