Test script testing | Python Fiddle

from random import randint

class Bet:
    def __init__(self):
        self.nots=[-1,0]
        self.nums=[1, 2, 3]
        self.pays = 2.0
    
    def checkWin(self, roll):
        return roll not in self.nots and roll in self.nums
        
    def pay(self, sim, bet, won):
        if won:
            sim.cash = sim.cash + (bet * self.pays)
        
        sim.cash = sim.cash - bet
        #print sim.cash
        
    def check(self, sim, roll, bet):
        win=roll not in self.nots and self.checkWin(roll)
        self.pay(sim, bet, win)

class Even(Bet):
    def checkWin(self, roll): return roll % 2 == 0

class Odd(Bet):
    def checkWin(self, roll): return roll % 2 == 1

class FirstHalf(Bet):
    def checkWin(self, roll): return roll <= 18

class SecondHalf(Bet):
    def checkWin(self, roll): return roll >= 19
    
class FirstThird(Bet):
    def __init__(self):
        Bet.__init__(self)
        self.pays=3.0
    def checkWin(self, roll): return roll <= 12

class RSim:
    def __init__(self):
        self.cash = 100
        
    def sim (self, bets, rounds):
        
        for j in range(rounds):
            roll = randint(-1, 36)
            for i in bets:
                i.check(self, roll, 1)

r=RSim()
r.sim([SecondHalf(), FirstThird()], 1000)
print r.cash

#for i in range(100): print randint(-2, 5)

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