RIndex()
The Python RIndex method is one of the Python String Method which is used to return the index position of the last occurrence of a specified string. It will return ValueError, if the specified string is not found. In this article we will show you, How to write RIndex() Function in Python Programming with example.
TIP: The index position in RIndex() Function will start from 0, Not 1.
Python RIndex Syntax
The basic syntax of the Python RIndex function is as shown below:
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String_Value.RIndex(Substring, Starting_Position, Ending_Position) |
- String_Value: Please select the valid String literal.
- Substring: Please specify the string you want to search for.
- Starting_Position: This is an optional parameter. If you want to specify the starting point (starting index position) then, Please specify the index value here. If you Omit this parameter then, RIndex() Function will consider Zero as starting position.
- Ending_Position: This is an optional parameter. If you want to specify the end point (Ending index position) then, Please specify the index value here. If you Omit this parameter then, RIndex() Function will consider the highest index number
Python RIndex method Example
The following set of examples will help you understand the RIndex() Function in Python.
PYTHON CODE
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# Python RIndex Method Example Str1 = 'We are abc working at abc company'; Str2 = Str1.rindex('abc') print('First Output of a RIndex() method is = ', Str2) # Performing RIndex() function directly Str3 = 'Find Tutorial at Tutorial Gateway'.rindex('Tutorial') print('Second Output of a RIndex() method is = ', Str3) # Using First Index while finding the String Str4 = Str1.rindex('abc', 12) print('Third Output of a RIndex() method is = ', Str4) # Using First & Second Index while finding the String Str5 = Str1.rindex('abc', 2, 21) print('Fourth Output of a RIndex() method is = ', Str5) # Searching for Not existing Item Str6 = Str1.rindex('Tutorial') print('Fifth Output of a RIndex() method is = ', Str6) |
OUTPUT
ANALYSIS
First we declared the String variable Str1 and assigned corresponding value using following statement
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Str1 = 'We are abc working at abc company'; |
Following statement will find the last occurrence of a substring ‘abc’ inside the Str1 using RIndex() function and prints the output
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Str2 = Str1.rindex('abc') print('First Output of an Index() method is = ', Str2) |
The Python RIndex function allows us to use Starting index position. By specifying starting index position we can increase the performance
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Str4 = Str1.rindex('abc', 12) print('Third Output of a RIndex() method is = ', Str4) |
The Python RIndex() function allows us to use Starting and ending indices. By specifying starting and ending index position we can increase the performance. Following statement will start looking for ‘abc’ from index position 2 and end at index position 21. As we all know second abc is at position 22 so, it will return index position of first abc
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Str5 = Str1.rindex('abc', 2, 21) print('Fourth Output of a RIndex() method is = ', Str5) |
Following statement is returning Value Error because, RIndex() function will start looking for substring ‘Tutorial’ inside the Str1, which does not exists.
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Str6 = Str1.rindex('Tutorial') print('Fifth Output of a RIndex() method is = ', Str6) |
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