rindex() function in python by R4R Team

- rindex() is python in-build function which are used to find the index of the substring in the given string.
- rindex() is not the applicable for list data type.

Syntax-

str.rindex(str1,beg,end)

- here str is given string.
- and str1 is the substring whose index is to be find
- beg and end are the starting and ending point of given string where you want to search.

Difference between index() and rindex() in python-

Basically, both function are used to search the location of the substring in given string but
- index() start searching from the left side of the string and also applicable for list.
- and rindex() start searching from the right side of the string and not applicable for list.

Example

string is s="This is is string"
s.index("is") will give 5
s.rindex("is") will give 8


program-

s="this is is string"
print(s.rindex("is"))

s="Hello program"
print(s.rindex("o"))

s="mytext"
print(s.rindex("m"))

s="mytext"
print(s.rindex("t"))


s="mytext"
print(s.rindex("t",0,3))

output-

8
8
0
5
2

-In this program, we search the location of substring in given string by using s.rindex(str).
- In last line, we use s,rindex("t",0,3) it means that we find the 't' in only in range 0 to 3 so it will give index 2 value.
- if it not find the searching element in given string then it will give an error like ValueError: substring not found