Str.index & Str.rindex

Str.index will return the lowest index in a string where substring sub is found and raise values error if substring not found in given string.

Syntax of Str.index:

index(sub, start, end)

sub=an element or object which index is to be determined.

start=starting index (must be an integer)

end=ending index(must be an integer)

a=’weather’

a.index(‘er’)

Output:5

er is present at 5 position in given string. It returns lowest index of object.

The Syntax of Str.rindex is same but it will return highest index in string where substring found as shown below