Fibonacci - Python implementation

fib.py

import sys
from timeit import timeit

RUNS = 100


def fibonacci(n: int) -> int:
    if n <= 1:
        return n
    return fibonacci(n - 1) + fibonacci(n - 2)


def main():
    n = int(sys.argv[1])
    print(f"{fibonacci(n) = }")

    python_time_per_call = timeit(lambda: fibonacci(n), number=RUNS) / RUNS
    print(f"\nPython μs per call: {python_time_per_call * 1_000_000:.2f} μs")
    print(f"Python ms per call: {python_time_per_call * 1_000:.2f} ms")


if __name__ == "__main__":
    main()