blackjack.py

import random

def cardName(card):
  face = {11:"Jack", 12:"Queen", 13:"King"}
  if card == 1: return "Ace"
  if card > 10: return face[card]
  else        : return str(card)

def hit(hand, card):
  if   card == 1: return (hand[0] + 1, True)
  elif card > 10: return (hand[0] + 10, hand[1])
  else          : return (hand[0] + card, hand[1])
  
def sumHand(hand):
  if   hand[0] >  21            : return "bust"
  elif hand[0] <= 11 and hand[1]: return hand[0] + 10
  else                          : return hand[0]

def deal(hitPred, hand, cards):
  score = sumHand(hand)
  while score != 21 and score != "bust" and hitPred(score):
    card = next(cards)
    print("Dealt:", cardName(card))
    hand  = hit(hand, card)
    score = sumHand(hand)
  return score

def askBet(left):
  while True:
    bet = int(input("How much will you bet?\n"))
    if   bet < 1   : print("Minimum bet is 1.")
    elif bet > 1000: print("Maximum bet is 1000.")
    elif bet > left: print("You don't have that many credits left!")
    else           : return bet
  
def cardGen():
  decks = list(range(1, 13)) * 24
  while True:
    shuffled = decks
    random.shuffle(shuffled)
    while len(shuffled) > 52: yield shuffled.pop()

decks = cardGen()
(pCreds, dCreds, gamesLeft) = (10000, 10000, 10000)

while --gamesLeft >= 0 and pCreds > 0 and dCreds > 0:
  print("You have", pCreds, "credits. The dealer has", str(dCreds) + ".")
  bet = askBet(pCreds)
  dBet = min(dCreds, bet)
  (pCreds, dCreds, bet) = (pCreds - bet, dCreds - dBet, bet + dBet)
  hand = [next(decks), next(decks)]
  print("Your hand:", ", ".join(map(cardName, hand)))
  pHand = hit(hit([0, False], hand[1]), hand[0])
  hand = [next(decks), next(decks)]
  dHand = hit(hit([0, False], hand[1]), hand[0])
  pScore = deal(
    lambda n: input("Score: " + str(n) + ". Hit? (y/n)\n") == "y",
    pHand, decks
  )
  if pScore == "bust":
    dCreds += bet
    print("You lost!")
    continue
  elif pScore == 21 and sumHand(dHand) != 21:
    pCreds += bet
    print("You won!")
    continue
  print("Dealer's hand:", ", ".join(map(cardName, hand)))
  dScore = deal(lambda n: n < 17, dHand, decks)
  if dScore == "bust" or pScore > dScore:
    pCreds += bet
    print("You won!")
  else:
    dCreds += bet
    print("You lost!")