Python string rindex














































Python string rindex



Python String : rindex()


This article demonstrates how to use of rindex() method in string.

The rindex() method returns the highest index of the substring inside the string (if found). If the substring is not found, it raises an exception.


Syntax :

string.rindex(sub,start,end)


Parameter Values :

ParameterDescription
subIt's the substring to be searched in the string .
startOptional. starting index within the string where search starts.
endOptional. ending index within the string where search ends.


Returns :

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

The 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.



Sample Code :
1.
string = 'Let it be, let it be, let it be'

result = string.rindex('let it')
print("Substring 'let it':", result)

result = string.rindex('small')
print("Substring 'small ':", result)

result = string.rindex('be,')
if  (result != -1):
  print("Highest index where 'be,' occurs:", result)
else:
  print("Doesn't contain substring")
Output :
Substring 'let it'22                                                                                                                        
Traceback (most recent call last):                                                                                                            
  File "main.py", line 6in <module>                                                                                                         
    result = string.rindex('small')                                                                                                           
ValueError: substring not found 


Hence,we can see above function rindex() same as index(), but search backwards in string.


**********END OF ARTICLE **********


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