Python: Find the first repeated word in a given string

Last update on December 21 2024 07:46:47 (UTC/GMT +8 hours)

Find first repeated word in string.

Write a Python program to find the first repeated word in a given string.

Visual Presentation:

Sample Solution:

Python Code:

# Define a function 'first_repeated_word' that takes a string 'str1' as input.
def first_repeated_word(str1):
    # Create an empty set 'temp' to store unique words encountered.
    temp = set()
    
    # Iterate through each word in the string 'str1' by splitting it using spaces.
    for word in str1.split():
        # Check if the word is already in the 'temp' set.
        if word in temp:
            return word  # Return the first repeated word found.
        else:
            temp.add(word)  # Add the word to the 'temp' set if it's not already there.

    return 'None'  # Return 'None' if no repeated word is found.

# Call the 'first_repeated_word' function with different input strings and print the results.
print(first_repeated_word("ab ca bc ab"))
print(first_repeated_word("ab ca bc ab ca ab bc"))
print(first_repeated_word("ab ca bc ca ab bc"))
print(first_repeated_word("ab ca bc")) 

Sample Output:

ab
ab
ca
None       

Flowchart:

Python Code Editor:

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