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Recursion in Python is when a function calls itself to solve a problem by breaking it into smaller subproblems. Every recursive function must have a base case (to stop recursion) and a recursive case (where it calls itself with modified arguments) .
Example – Factorial using Recursion:
def factorial(n):# Base caseif n == 0 or n == 1:return 1# Recursive casereturn n * factorial(n - 1)print(factorial(5)) # Output: 120Copied!✕CopyHere, the base case stops recursion when n is 0 or 1, and the recursive case reduces the problem size until the base case is reached .
Example – Fibonacci Sequence:
def fibonacci(n):if n <= 1: # Base casesreturn nreturn fibonacci(n - 1) + fibonacci(n - 2) # Recursive callsprint(fibonacci(7)) # Output: 13Copied!✕CopyThis works by summing results of smaller subproblems until reaching the base cases .
Key Points for Adding Recursion:
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Recursion in Python - GeeksforGeeks
6 days ago · Recursion can be broadly classified into two types: tail recursion and non-tail recursion. The main difference between them is related to what happens after recursive call.
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