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Python Programs - String

Find the longest word in a sentence - Python Program

Example 1 :

Python 
sentence = "Python is very powerful"
words = sentence.split()
print(max(words, key=len))

Output

 
OUTPUT  :
powerful

Example 2 :

Python 
def find_longest_word(sentence):
  """
  Finds the longest word in a given sentence.

  Args:
    sentence: The input sentence string.

  Returns:
    The longest word found in the sentence.
  """
  # Split the sentence into individual words based on whitespace.
  # The split() method returns a list of words.
  words = sentence.split()  

  # Handle the case of an empty sentence to prevent errors.
  if not words:
    return ""

  # Use the max() function with the key argument set to len.
  # This tells max() to compare words based on their length,
  # returning the word with the maximum length.
  longest_word = max(words, key=len) 
  
  return longest_word

# Example usage:
input_sentence = "The quick brown fox jumped over the lazy dog."
longest_word = find_longest_word(input_sentence)

print(f"The longest word in the sentence is: {longest_word}")

input_sentence_2 = "Python is a versatile programming language."
longest_word_2 = find_longest_word(input_sentence_2)

print(f"The longest word in the sentence is: {longest_word_2}")

# Example with punctuation
input_sentence_3 = "Hey!! there, How is it going????"
longest_word_3 = find_longest_word(input_sentence_3)

print(f"The longest word in the sentence is: {longest_word_3}")

# Example with an empty sentence
input_sentence_4 = ""
longest_word_4 = find_longest_word(input_sentence_4)

print(f"The longest word in the sentence is: {longest_word_4}")

Output

 
OUTPUT  :
The longest word in the sentence is: jumped
The longest word in the sentence is: programming
The longest word in the sentence is: going????
The longest word in the sentence is:

Explanation:

find_longest_word(sentence) function:

  • Takes a sentencestring as input.
  • Uses split()to divide the sentence into a list of words, where whitespace acts as the delimiter.
  • If the list of words is empty (meaning the input sentence was empty), it returns an empty string to handle this edge case gracefully.
  • Employs the max()function along with key=len to find the word in the words list with the maximum length.
  • Returns the longest_word

 

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