Python: Reverse a string if it's length is a multiple of 4

Last update on April 19 2025 13:05:33 (UTC/GMT +8 hours)

Reverse string if length is a multiple of 4.

Write a Python function to reverse a string if its length is a multiple of 4.

Sample Solution:

Python Code:

# Define a function named reverse_string that takes one argument, 'str1'.
def reverse_string(str1):
    # Check if the length of the input string 'str1' is divisible by 4 with no remainder.
    if len(str1) % 4 == 0:
        # If the length is divisible by 4, reverse the characters in 'str1' and join them together.
        return ''.join(reversed(str1))
    
    # If the length of 'str1' is not divisible by 4, return 'str1' as it is.
    return str1

# Call the reverse_string function with different input strings and print the results.
print(reverse_string('abcd'))   # Output: 'dcba' (Reversed)
print(reverse_string('python')) # Output: 'python' (Not reversed)

Sample Output:

dcba                                                                                                          
python 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python function to check if the length of a string is divisible by 4, and if so, return the reversed string.
• Write a Python program to conditionally reverse a string based on its length using a ternary operator.
• Write a Python program to use recursion to reverse a string only if its length is a multiple of 4.
• Write a Python program to implement this transformation by checking the length modulo 4 and then reversing using slicing.

Go to:

• Python Data Type String Exercises Home ↩
• Python Exercises Home ↩

Previous: Write a Python program to get the last part of a string before a specified character.
Next: Write a Python function to convert a given string to all uppercase if it contains at least 2 uppercase characters in the first 4 characters.

Python Code Editor:

Contribute your code and comments through Disqus.