coinFlipStreaks.py

'''
Chapter 4 Lists

Coin Flip Streaks

For this exercise, we’ll try doing an experiment. If you flip a coin 100 times
and write down an “H” for each heads and “T” for each tails, you’ll create
a list that looks like “T T T T H H H H T T.” If you ask a human to make
up 100 random coin flips, you’ll probably end up with alternating headtail 
results like “H T H T H H T H T T,” which looks random (to humans),
but isn’t mathematically random. A human will almost never write down
a streak of six heads or six tails in a row, even though it is highly likely
to happen in truly random coin flips. Humans are predictably bad at
being random.
Write a program to find out how often a streak of six heads or a streak
of six tails comes up in a randomly generated list of heads and tails. Your
program breaks up the experiment into two parts: the first part generates
a list of randomly selected 'heads' and 'tails' values, and the second part
checks if there is a streak in it. Put all of this code in a loop that repeats
the experiment 10,000 times so we can find out what percentage of the coin
flips contains a streak of six heads or tails in a row. As a hint, the function
call random.randint(0, 1) will return a 0 value 50% of the time and a 1 value
the other 50% of the time.

'''

import random
numberOfStreaks = 0
for experimentNumber in range(10000):
    resultList = []
    for i in range(100):
        result = random.randint(0,1)
        resultList.append(result)

    counterzero = 0
    counterone = 0
    for res in resultList:
        if res == 0:
            counterzero+=1
            counterone=0
        elif res == 1:
            counterzero=0
            counterone+=1

        if counterzero == 6 or counterone == 6:
            counterzero = 0
            counterone = 0
            numberOfStreaks+=1
            break

print('Chance of streak: %s%%' % (numberOfStreaks / 100))