fib.py

#! /usr/bin/env python

import time
import sys

def fib(n):
    return n if n <= 1 else fib(n-1) + fib(n-2)

def get_time():
    return int(round(time.time() * 1000))

if __name__ == '__main__':
    start = get_time()
    N = int(sys.argv[1])
    print("Fibonacci from 0 to %d:" % N)
    for (i, fi) in map(lambda i: (i, fib(i)), range(N+1)):
        print("%d: %d" % (i, fi))
    stop = get_time()
    print("time: %d ms" % (stop-start))

Output

$ python2 fib.py 32 # Nothing happens for a few secs and then the fibonacci numbers are printed

$ python3 fib.py 32 # The fibonacci numbers are printed one by one with a greater and greater interval