Find index of last occurrence of a character in a Python string

This post will discuss how to find the index of the last occurrence of a character in a string in Python.

1. Using `rfind()` function

A simple solution to find the last index of a character in a string is using the rfind() function, which returns the index of the last occurrence in the string where the character is found and returns -1 otherwise.

if __name__ == '__main__':

s = "Hello, World"

c = 'o'

index = s.rfind(c)

if index != -1:

print(f"Char '{c}' is found at index {index}") # Char 'o' is found at index 8

else:

print("Char not found")

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2. Using `rindex()` function

Alternatively, you can use the rindex() function, which differs from the rfind() function as rfind() returns -1 while rindex() raises an exception ValueError when the character is not found.

if __name__ == '__main__':

s = "Hello, World"

c = 'o'

try:

index = s.rindex(c)

print(f"Char '{c}' is found at index {index}") # Char 'o' is found at index 8

except:

print("Char not found")

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3. Using `more_itertools.rlocate()` function

Finally, you can use the more_itertools.rlocate() function to search for specific characters in a string. It yields an index of each character in the string for which the specified predicate is satisfied.

import more_itertools

if __name__ == '__main__':

s = "Hello, World"

c = 'o'

index = next(more_itertools.rlocate(s, lambda x: x == c))

if index != -1:

print(f"Char '{c}' is found at index {index}") # Char 'o' is found at index 8

else:

print("Char not found")

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That’s all about finding the index of the last occurrence of a character in a string in Python.

Find index of last occurrence of a character in a Python string

1. Using rfind() function

2. Using rindex() function

3. Using more_itertools.rlocate() function

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1. Using `rfind()` function

2. Using `rindex()` function

3. Using `more_itertools.rlocate()` function