roulette

import random
players = {}
betlocation = None
spinbet = 0
r_black = [2, 4, 6, 8, 10, 11, 13, 15, 17, 20, 22, 24, 26, 28, 29, 31, 33, 35]
r_red = [1, 3, 5, 7, 9, 12, 14, 16, 18, 19, 21, 23, 25, 27, 30, 32, 34, 36]
r_low = list(range(1, 18))
r_high = list(range(19, 36))
r_even = [2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36]
r_odd = [1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35]
r_firstdozen = list(range(1, 12))
r_seconddozen = list(range(13, 24))
r_thirddozen = list(range(25, 36 ))
r_firstcolumn = [1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34]
r_secondcolumn = [2, 5, 8, 11, 14, 17, 20, 23, 26, 29, 32, 35]
r_thirdcolumn  = [3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36]
result = None
r_number = result
numl = []
str_range = list(range(-1,37))
r_range = range(-1, 36)
r_list = ['black', 'red', 'low', 'high', 'even', 'odd', 'first dozen', 'second dozen', 'third dozen', 'first column', 'second column', 'third column', str_range,]
pots = 1
def inputplayers():
    playername = None
    while playername != '':
        playername = str(input('Player Name? : '))
        if playername != '':
            players[playername] = 500
def checkup():
    global pots
    for key in players:
        print('Current Pot for', key, ':',  players[key])
    pots = sum(players.values())
def checkpots():
    global pots
    pots = sum(players.values())
def check():
    global result
    global betlocation
    global spinbet
    if betlocation is black:
        if result in r_black:
            spinbet = spinbet * 2
def spin():
    global result
    result = random.randint(-1, 36)
def bet():
    global r_list
    global pots
    global spinbet
    global players
    global s_bet
    for key in players:
        betlocation = None
        maxbet = players[key]
        while betlocation != '':
            if maxbet <= 0:
                betlocation = ''
                continue
            betlocation = str(input('\nType help for list of bets.\n' + 'What bet would you like, ' + key + '? : ')).lower()
            if betlocation == 'help':
                print('Possible bets are :' , r_list)
                continue
            if betlocation not in r_list and betlocation not in str(str_range):
                print('Invalid bet!')
                continue
            if betlocation != '':
                print('\nmax bet for ', key, ' is : ', maxbet)
                spinbet = input('How Much would you like to bet? : ')
                try:
                    spinbet = int(spinbet)
                except:
                    print('Invalid Bet')
                    continue
                if spinbet > maxbet:
                    print('That bet is too large!')
                    continue
                players[key] -= spinbet
                maxbet -= spinbet
                if betlocation == 'black':
                    if result in r_black:
                        spinbet = spinbet * 2
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'red':
                    if result in r_red:
                        spinbet = spinbet * 2
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'low':
                    if result in r_low:
                        spinbet = spinbet * 2
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'high':
                    if result in r_high:
                        spinbet = spinbet * 2
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'odd':
                    if result in r_odd:
                        spinbet = spinbet * 2
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'even':
                    if result in r_even:
                        spinbet = spinbet * 2
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'first dozen':
                    if result in r_firstdozen:
                        spinbet = spinbet * 3
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'second dozen':
                    if result in r_seconddozen:
                        spinbet = spinbet * 3
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'third dozen':
                    if result in r_thirddozen:
                        spinbet = spinbet * 3
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'first column':
                    if result in r_firstcolumn:
                        spinbet = spinbet * 3
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'second column':
                    if result in r_secondcolumn:
                        spinbet = spinbet * 3
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation == 'third column':
                    if result in r_thirdcolumn:
                        spinbet = spinbet * 3
                    else:
                        spinbet = 0
                    players[key] += spinbet
                if betlocation in str(r_range):
                    if str(result) == betlocation:
                        spinbet = spinbet * 36
                    else:
                        spinbet = 0
                    players[key] += spinbet

print ('Welcome to Roulette!\nPress enter when done!')
inputplayers()
while pots > 0:
    checkup()
    spin()
    bet()
    print('\nThe ball lands on :', result)
    checkpots()
print('Game Over, Thanks for playing!')