flip.py

#!/usr/bin/env python

import sys
import random

def main(flips):
    print('Flipping {} times.'.format(flips))
    count = 0
    for i in range(flips):
        count += flip()

    print('{} %'.format(float(count)/flips*100))

def flip():
    if bool(random.getrandbits(1)):
        return 1

    return 0

# python flip.py 10
# python flip.py 159
# python flip.py 19502
# python flip.py 10000000
main(flips=int(sys.argv[1]))