Craps.py

from random import SystemRandom
from itertools import count


class Craps:
    random = SystemRandom()

    class Holder:  # simple class for holding a value so I can assign and retrieve it inside of a while loop
        def __init__(self): self.val = None
        def set(self, val): self.val = val; return val
        def get(self): return self.val

    def print(self, *data, **kwargs):
        if self.verbose:
            for datum in data:
                print(datum, **kwargs)

    def __init__(self, starting_balance, verbose=False):
        self.wallet = starting_balance
        self.wins, self.losses = 0, 0
        self.random = SystemRandom()
        self.verbose = verbose
        self.holder = Craps.Holder()
        self.rolls = {i + 1: 0 for i in range(12)}
        self.roll_cnt = 0

    def roll(self):
        r1, r2 = self.random.randint(1, 6), self.random.randint(1, 6)
        r = r1 + r2
        self.print("Rolled {} and {} ({}).".format(r1, r2, r))
        return r

    def play(self, bet):
        assert isinstance(bet, int)
        while self.holder.set(self.roll()) in {2, 3, 12}:
            pass  # keep rolling until you get a 4-11.
        r = self.holder.get()
        self.rolls[r] += 1
        self.print("Continuing to second roll.")
        while self.holder.set(self.roll()) in {4, 5, 6, 7, 8, 9, 10, 11}:
            r = self.holder.get()
            self.rolls[r] += 1
            if r in (7, 11):
                self.wallet += bet
                return True
        r = self.holder.get()
        self.rolls[r] += 1
        self.wallet -= bet
        return False

    @staticmethod
    def safe_cast(new_type, val, default=None):
        try:
            default = new_type(val)
        finally:
            return default

    def run(self, cnt=None):
        assert cnt is None or isinstance(cnt, int)
        iterations = count() if cnt is None else range(cnt)
        for _ in iterations:
            bet = None
            while bet is None or (isinstance(bet, int) and bet > self.wallet):
                bet = self.safe_cast(int, input("Enter a bet (Cash: ${}): ".format(self.wallet)))
                if bet is None:
                    print("Invalid. ")
                elif bet > self.wallet:
                    print("You only have %{}".format(self.wallet))
            self.play(bet)
            if self.wallet == 0:
                print("You crapped out.")
                return

c = Craps(100, True)
c.run(None)