sequence.py

import random

def coinflip(l):
    s = ''
    for i in range(0, l):
        flip = random.choice(['H', 'T'])
        s += flip
    return s

def montecarlo(i):
    numHHHT = 0
    numHHHH = 0

    for ii in range(0, i):
        flip_result = coinflip(20)
        numHHHH += 1 if ("HHHH" in flip_result) else 0
        numHHHT += 1 if ("HHHT" in flip_result) else 0

    print(f"num HHHT = {numHHHT}")
    print(f"num HHHH = {numHHHH}")

montecarlo(10000)