Python: Change a given string to a new string where the first and last chars have been exchanged

Last update on April 19 2025 13:05:37 (UTC/GMT +8 hours)

Swap first and last chars of a string.

Write a Python program to change a given string to a newly string where the first and last chars have been exchanged.

Sample Solution:

Python Code:

# Define a function named change_string that takes one argument, 'str1'.
def change_string(str1):
    # Return a modified version of the input string 'str1' by rearranging its characters.
    # It takes the last character and moves it to the front, while keeping the middle characters unchanged.
    return str1[-1:] + str1[1:-1] + str1[:1]

# Call the change_string function with different input strings and print the results.
print(change_string('abcd'))   # Output: 'dbca'
print(change_string('12345'))  # Output: '52341' 

Sample Output:

dbca                                                                                                          
52341

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to exchange the first and last characters of a string using slicing.
• Write a Python program to convert the string to a list, swap the first and last elements, and then join it back into a string.
• Write a Python program to implement this swap recursively by handling the first and last characters separately.
• Write a Python program to validate string length and perform the swap only if the length is greater than one.

Go to:

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

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