In this post, we will learn how to write a python program to reverse a string using recursion with a detailed explanation and algorithm.

With the help of the recursive function and slicing operator, we can easily reverse a String in python but before we jump into writing a program few programming concepts you have to know and that is:

1. How to take user-input
2. Slicing in Python
3. Python Function &
4. how recursive function work

## Algorithm to Reverse a String Using Recursion

• Define a function (`def reverse_str(my_str)`).
• check `if len(my_str) == 0` return `my_str`
• `else` return a recursive function `reverse_str(my_str[1:]) + my_str`

## Source Code

``````def reverse_str(my_str):
if len(my_str) == 0:
return my_str
else:
return reverse_str(my_str[1:]) + my_str

print(f"Given String: {my_string}")
print(f"reversed String: {reverse_str(my_string)}")
``````

## Explanation

1. The code starts with defining a function `reverse_str` that takes a string as input called `my_str`.
2. Inside the function, there is an if statement that checks if the length of the `my_str` string is equal to zero then it will return `my_str` as it is.
3. else the function calls itself but with a modified string `my_str[1:]`. This slicing removes the first character of the string.
4. The result of the recursive call is then concatenated with the first character of the original `my_str` string (`my_str`), and the result is returned.
5. 2nd, 3rd and 4th steps are repeated until the length of the string is zero (`len(my_str) == 0`).
6. after that, we take input from the user and store it in the `my_string` variable.
7. Call the function `reversed_str(my_string)` and print the result. Hi, I'm Yagyavendra Tiwari, a computer engineer with a strong passion for programming. I'm excited to share my programming knowledge with everyone here and help educate others in this field.