Python: Reverse all the words which have odd length

Last update on April 17 2025 13:00:47 (UTC/GMT +8 hours)

Reverse Odd-Length Words

Write a Python program to reverse all words of odd lengths.

Sample Solution-1:

Python Code:

# Define a function 'test' that takes a string as input.
def test(txt):
    # Use a generator expression within 'join' to reverse words with odd length and keep others unchanged.
    return ' '.join(i[::-1] if len(i) % 2 else i for i in txt.split())

# Test case 1
text1 = "The quick brown fox jumps over the lazy dog"
print("Original string:")
print(text1)
print("Reverse all the words of the said string which have odd length:")
print(test(text1))

# Test case 2
text2 = "Python Exercises"
print("\nOriginal string:")
print(text2)
print("Reverse all the words of the said string which have odd length:")
print(test(text2))

Sample Output:

Original string:
The quick brown fox jumps over the lazy dog
Reverse all the words of the said string which have odd length:
ehT kciuq nworb xof spmuj over eht lazy god

Original string:
Python Exercises
Reverse all the words of the said string which have odd length:
Python sesicrexE

Explanation:

Here is a breakdown of the above Python code:

test Function:

The "test()" function takes a string as input.
It uses a generator expression within the "join" method to iterate over the words of the string.
For each word, if the length of the word is odd, it reverses the word (i[::-1]), otherwise, it keeps the word unchanged (i).

Flowchart:

Sample Solution-2:

Python Code:

# Define a function 'test' that takes a string as input.
def test(text):
    # Split the input string into a list of words using space as the delimiter.
    result = list(text.split(' '))
    
    # Iterate through each word in the list.
    for i in range(len(result)):
        # Check if the length of the current word is odd.
        if len(result[i]) % 2 == 1:
            # If the length is odd, reverse the word.
            result[i] = result[i][::-1]
    
    # Join the modified words back into a string using space as the separator.
    return ' '.join(result)

# Test case 1
text1 = "The quick brown fox jumps over the lazy dog"
print("Original string:")
print(text1)
print("Reverse all the words of the said string which have odd length:")
print(test(text1))

# Test case 2
text2 = "Python Exercises"
print("\nOriginal string:")
print(text2)
print("Reverse all the words of the said string which have odd length:")
print(test(text2))

Sample Output:

Original string:
The quick brown fox jumps over the lazy dog
Reverse all the words of the said string which have odd length:
ehT kciuq nworb xof spmuj over eht lazy god

Original string:
Python Exercises
Reverse all the words of the said string which have odd length:
Python sesicrexE

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to reverse only the words in a sentence that have an odd number of characters.
Write a Python program to process a string and output each word reversed if its length is odd.
Write a Python program to scan a sentence and invert the letters of words that have odd lengths.
Write a Python program to iterate through a sentence and reverse only those words with an odd number of letters.

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Python Code Editor:

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