Blackjack casino game
def printIntro():
    print("This program simulates a bunch of blackjack games.")


Python style guide recommend lowercase_with_underscores for function names

def getInputs():
    while True:
        n = eval(input("How many games should be simulated? "))


not a really good idea to use eval, because that allows the user to input any python expression which may not make sense. Instead use int, which will only allow numbers

        if n &lt;= 0:
            print("You must enter a number greater than zero!")
        else:
            break

    return n

def simOneGame():
    score = 0
    blacklist = [2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 10, 10, 11]
    while not gameOver(score):
        blackscore = blacklist[randrange(len(blacklist))]


Python has a function, random.choice() which returns a random element from a list.

        score = score + blackscore

        if score &gt;= 17: 
             break


Why? The loop will terminate anyways. There doesn't seem to be a reason to break here

        if blackscore == 11 and (score &gt;= 6 and score &lt;= 10): 
            score = score + 11
        else:
            score = score + 1


I assume that this has to do with handling aces, but I don't understand the logic. You've already added blackscore to score, so I wouldn't think this would do the right thing. Also, couldn't you need to change the value of an ace to a 1, from an eleven due to later cards?

    return score


You only really care about busts/holds so maybe you should return True or False?

def simNGames(n):
    holds = 0
    busts = 0
    for i in range(n):
        score = simOneGame()
        if score &gt;= 22:
            busts = busts + 1
        else:
            holds = holds + 1

    return holds, busts

def gameOver(score):
    return score &gt;= 22 or score &gt;= 17


That's the same as score >= 17, no reason to include the first part of the condition

def printSummary(holds, busts):
    n = holds + busts
    print("Number of holds and busts: Holds: {0:0} Busts: {1:0}".format(holds, busts))
    print("Percentage of holds and busts: Holds: {0:0.1%}".format(holds / n), end = " ")
    print("Busts: {0:0.1%}".format(busts / n))

def main():
    printIntro()
    n = getInputs()
    score = simOneGame()
    holds, busts = simNGames(n)
    printSummary(holds, busts)

if __name__ == "__main__":
    main()