How to Print the Last Word in a sentence using Python?

Extracting the last word from a sentence is a common text processing task in Python. This can be accomplished using the split() method to break the sentence into words and accessing the last element.

Using split() Method

The split() method divides a string into a list of words, making it easy to access the last word using negative indexing.

Syntax

string.split(separator, maxsplit)

Parameters:

• separator Optional. Specifies the delimiter (default is whitespace)

• maxsplit Optional. Maximum number of splits (default is -1 for all occurrences)

Example

def print_last_word(sentence):
    # Split the sentence into words
    words = sentence.split()
    
    # Get the last word using negative indexing
    last_word = words[-1]
    
    # Print the last word
    print("Last word:", last_word)

# Example usage
sentence = "Python is a powerful programming language"
print_last_word(sentence)

# Another example
sentence2 = "TutorialsPoint provides excellent tutorials"
print_last_word(sentence2)

Last word: language
Last word: tutorials

Using rsplit() for Efficiency

For large sentences, rsplit() with maxsplit=1 is more efficient as it only splits from the right once ?

def get_last_word_efficient(sentence):
    # Split from right, only once
    parts = sentence.rsplit(' ', 1)
    return parts[-1] if parts else ""

sentence = "This is a very long sentence with many words"
last_word = get_last_word_efficient(sentence)
print("Last word:", last_word)

Last word: words

Handling Edge Cases

Consider scenarios with empty strings, single words, or extra whitespace ?

def robust_last_word(sentence):
    # Strip whitespace and check if empty
    sentence = sentence.strip()
    if not sentence:
        return "No words found"
    
    words = sentence.split()
    return words[-1]

# Test edge cases
test_cases = [
    "Single",
    "Multiple words here",
    "   Extra   spaces   ",
    "",
    "   "
]

for test in test_cases:
    result = robust_last_word(test)
    print(f"'{test}' ? {result}")

'Single' ? Single
'Multiple words here' ? here
'   Extra   spaces   ' ? spaces
'' ? No words found
'   ' ? No words found

Comparison of Methods

Common Use Cases

Extracting the last word is useful in various applications:

• Text Processing Analyzing file extensions, usernames, or domain names

• Natural Language Processing Sentiment analysis and keyword extraction

• Data Validation Checking format compliance in user inputs

• Log Analysis Extracting status codes or error types from log entries

Conclusion

Use split()[-1] for simple last word extraction. For better performance with large text, use rsplit(' ', 1)[-1]. Always handle edge cases like empty strings for robust applications.