Python String rindex()

The syntax of rindex() is:

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

rindex() Parameters

rindex() method takes three parameters:

  • sub - substring to be searched in the str string.
  • start and end(optional) - substring is searched within str[start:end]

Return Value from rindex()

  • If substring exists inside the string, it returns the highest index in the string where the substring is found.
  • If substring doesn't exist inside the string, it raises a ValueError exception.

rindex() method is similar to rfind() method for strings.

The only difference is that rfind() returns -1 if the substring is not found, whereas rindex() throws an exception.


Example 1: rindex() With No start and end Argument

 quote = 'Let it be, let it be, let it be' result = quote.rindex('let it') print("Substring 'let it':", result) result = quote.rindex('small') print("Substring 'small ':", result)

Output

 Substring 'let it': 22 Traceback (most recent call last): File "...", line 6, in <module> result = quote.rindex('small') ValueError: substring not found

Note: Index in Python starts from 0 and not 1.


Example 2: rindex() With start and end Arguments

 quote = 'Do small things with great love' # Substring is searched in ' small things with great love' print(quote.rindex('t', 2)) # Substring is searched in 'll things with' print(quote.rindex('th', 6, 20)) # Substring is searched in 'hings with great lov' print(quote.rindex('o small ', 10, -1))

Output

 25 18 Traceback (most recent call last): File "...", line 10, in <module> print(quote.rindex('o small ', 10, -1)) ValueError: substring not found

Also Read:

Did you find this article helpful?

Our premium learning platform, created with over a decade of experience and thousands of feedbacks.

Learn and improve your coding skills like never before.

Try Programiz PRO
  • Interactive Courses
  • Certificates
  • AI Help
  • 2000+ Challenges