python program to find nth fibonacci number

The Fibonacci sequence is a series of numbers in which each number is the sum of the two preceding ones, usually starting with 0 and 1. In this tutorial, we will create a Python program to find the Nth Fibonacci number using various methods.
This program uses an iterative approach to calculate the Nth Fibonacci number. It initializes a list fib with the first two Fibonacci numbers (0 and 1) and then iterates to calculate subsequent numbers until the Nth Fibonacci number is reached.
This program uses a recursive function to calculate the Nth Fibonacci number. It defines a base case for n = 1 and recursively calls itself for n - 1 and n - 2 until the base case is reached.
This program uses memoization to optimize the recursive approach by storing previously calculated Fibonacci numbers in a dictionary (memo). It avoids redundant calculations by checking if the result for a specific n is already in the memo dictionary.
Choose the method that best suits your requirements based on factors such as performance and simplicity.
ChatGPT