How to use RECURSIVE Function in Python? (Recursion in Python) - Python Tutorial for Beginners

Published: 23 April 2021
on channel: Digital Academy

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🖥️ How to use Recursive Function in Python? (Recursion in Python)

In Python, you already know that a Function can call other functions. It is even possible for the function to call itself. These types of construct are termed as Recursive Functions.

A Recursive Function in Python, is a function that calls itself and repeats its behaviour, UNTIL some condition is met - or return a result.

def my_function():
...
my_function()

○ Advantages of Recursion in Python
Recursive functions make the code look clean and elegant.
A complex task can be broken down into simpler sub-problems using recursion.
Sequence generation is easier with recursion than using some nested iteration.

○ Disadvantages of Recursion in Python
Recursive functions are hard to debug.
Sometimes the logic behind recursion is hard to follow through.
Recursive calls are expensive (inefficient) as they take up a lot of memory and time.

○ Example: Recursive Function in Python

In this example, countdown() is a Recursive Function in Python that calls itself, recursively, to countdown. If number is 0 or negative, it prints the word “Stop” then automatically exits this function. Otherwise, it prints number and then calls itself agin, passing "number-1" as the new argument.

def countdown(num):
if num == 0:
print('Stop')
else:
print(num)
countdown(num-1)

countdown(5)

OUTPUT: 5
OUTPUT: 4
OUTPUT: 3
OUTPUT: 2
OUTPUT: 1
OUTPUT: Stop

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