How to create a python function to calculate fibonacci

[dimwael]

How to create a python function to calculate fibonacci

[waelappgenai[bot]]

To create a Python function to calculate the Fibonacci sequence, we can use recursion or iteration. Here's an example using recursion:

def fibonacci(n):
    """
    Calculate the nth Fibonacci number.

    Args:
        n (int): The position of the desired Fibonacci number.

    Returns:
        int: The nth Fibonacci number.
    """
    if n <= 0:
        return 0
    elif n == 1:
        return 1
    else:
        return fibonacci(n-1) + fibonacci(n-2)

To use this function, simply call it with the desired position n:

print(fibonacci(10))  # Output: 55

This will print the 10th Fibonacci number, which is 55.

Alternatively, here's an iterative version:

def fibonacci(n):
    """
    Calculate the nth Fibonacci number.

    Args:
        n (int): The position of the desired Fibonacci number.

    Returns:
        int: The nth Fibonacci number.
    """
    if n <= 0:
        return 0
    elif n == 1:
        return 1
    else:
        a, b = 0, 1
        for i in range(n-1):
            a, b = b, a + b
        return b

This iterative approach is generally more efficient than the recursive version for larger values of n.