Calculate fib(n) using matrix exponentiation

fib.py

import numpy as np

def fib(n):
    """Fibonacci using matrix exponentiation"""
    m = np.array([[1, 1], [1, 0]])

    pow_m = np.linalg.matrix_power(m, n)

    return pow_m[0, 1]

# Print the first 20 to see that it actually works
for n in range(20):
    print(fib(n))

Fibonacci series are essential when you are just starting to learn code.