How to Use Recursion to Create a Countdown in Python

In this code:
Function Definition:
countdown is a recursive function that prints numbers in descending order until reaching 0.
Base Case:
The base case checks if n is less than or equal to 0.
If true, it prints "Blastoff!" to indicate the end of the countdown.
Recursive Case:
If n is greater than 0, it prints the current value of n and calls itself recursively with n-1.