斗地主是一款非常受欢迎的扑克牌游戏，很多人都喜欢在电脑或手机上玩斗地主。如果你是一个程序员或者对编程有一定基础的朋友，那么你可以尝试自建一个斗地主APP。本文将介绍如何通过编程实现一个简单的斗地主游戏。
一、游戏规则
在开始编写斗地主APP之前，我们要先了解游戏规则。斗地主的牌数为54张，包含了大小王，其中3个2为地主牌，玩家手中的牌由系统随机分配，地主牌由系统确定。游戏过程分为抢地主和出牌两个阶段，抢地主结束后，地主首先出牌，其余玩家依次出牌。出牌规则为必须出比上一家牌型大的牌，没有比上一家牌大的牌型则需要不出。出完牌后，上一位出牌者可以在本回合任意时刻重新出牌。
二、编程实现
1.初始化
游戏开始前，我们需要先创建牌堆和玩家列表，同时将54张牌洗牌。
```
def init():
cards = ['2_♥','2_♠','2_♣','2_♦', 'A_♥','A_♠','A_♣','A_♦', 'K_♥','K_♠','K_♣','K_♦', 'Q_♥','Q_♠','Q_♣','Q_♦', 'J_♥','J_♠','J_♣','J_♦', '10_♥','10_♠','10_♣','10_♦', '9_♥','9_♠','9_♣','9_♦', '8_♥','8_♠','8_♣','8_♦', '7_♥','7_♠','7_♣','7_♦', '6_♥','6_♠','6_♣','6_♦', '5_♥','5_♠','5_♣','5_♦', '4_♥','4_♠','4_♣','4_♦', '3_♥','3_♠','3_♣','3_♦', 'joker','JOKER']
random.shuffle(cards)
players = {'player1':[], 'player2':[], 'player3':[]}
return cards, players
```
2.抢地主
我们需要编写一个函数，实现抢地主的过程。系统向每个玩家发一张牌，最后一张牌为地主牌，拥有该牌的玩家成为地主。如果没有玩家抢地主，则系统会重新给玩家发牌，直到有玩家抢地主。
```
def robLandlord(players):
cards, players = init()
last_card = cards.pop()
for p in players.keys():
players[p].append(cards.pop())
flag = False
curr_player = 'player3'
while not flag:
print(players[curr_player])
action = input('请选择（抢地主/不抢）：')
if action == '抢地主':
players[curr_player].append(last_card)
flag = True
else:
players[curr_player].extend([cards.pop() for i in range(2)])
curr_player = getNextPlayer(curr_player)
return curr_player, players[curr_player]
```
3.牌型判断
在出牌过程中，我们需要实现对玩家出牌的牌型进行判断。可以先列出所有合法的牌型，然后通过编程逐一判断。
```
def getCardType(cards):
card_dic = {}
for card in cards:
if card.split('_')[0] not in card_dic:
card_dic[card.split('_')[0]] = 1
else:
card_dic[card.split('_')[0]] += 1
card_count = list(card_dic.values())
card_count.sort()
if len(cards)==1:
return 'single'
elif len(cards)==2 and card_count[0]==2:
return 'double'
elif len(cards)==3 and card_count[0]==3:
return 'triple'
elif len(cards)==4 and card_count[0]==4:
return 'bomb'
elif len(cards)==5 and card_count[0]==3 and card_count[1]==2:
return 'three_plus_two'
elif len(cards)==6 and card_count[0]==3 and card_count[1]==3:
return 'double_triple'
elif len(cards)==6 and card_count[0]==4 and card_count[1]==2:
return 'four_plus_two'
elif len(cards)==7 and card_count[0]==3 and card_count[1:]==[2,2]:
return 'three_plus_two_double'
elif len(cards)==8 and card_count[0]==4 and card_count[1:]==[2,2]:
return 'four_plus_two_double'
elif len(cards)==9 and card_count[0:3]==[3,3,3]:
return 'triple_straight'
elif len(cards)==10 and card_count[0:5]==[1,1,1,1,1] and isStraight(cards):
return 'straight'
elif len(cards)>=5 and isStraight(cards):
return 'straight'
else:
return 'invalid'
def isStraight(cards):
vals = []
for card in cards:
if card.split('_')[0] == 'A':
vals.append(14)
elif card.split('_')[0] == 'K':
vals.append(13)
elif card.split('_')[0] == 'Q':
vals.append(12)
elif card.split('_')[0] == 'J':
vals.append(11)
elif card.split('_')[0] == 'joker':
vals.append(15)
elif card.split('_')[0] == 'JOKER':
vals.append(16)
else:
vals.append(int(card.split('_')[0]))
vals.sort()
for i in range(len(vals)-1):
if vals[i+1]-vals[i]!=1:
return False
return True
```
4.出牌
在出牌过程中，我们需要判断出牌的合法性，如果非法则需要提醒玩家重新出牌。
```
def play(cards_prev, cards_curr):
if cards_curr == []:
return True, getCardType(cards_curr)
card_type_prev = getCardType(cards_prev)
card_type_curr = getCardType(cards_curr)
if card_type_curr == 'invalid':
return False, card_type_curr
elif card_type_curr == 'bomb':
if card_type_prev != 'bomb':
return True, card_type_curr
else:
if int(cards_curr[0].split('_')[0]) > int(cards_prev[0].split('_')[0]):
return True, card_type_curr
else:
return False, card_type_curr
elif card_type_curr == 'joker_bomb':
return True, card_type_curr
elif card_type_curr == card_type_prev:
if card_type_curr in ['single', 'double', 'triple']:
if int(cards_curr[0].split('_')[0]) > int(cards_prev[0].split('_')[0]):
return True, card_type_curr
else:
return False, card_type_curr
elif card_type_curr in ['three_plus_two', 'three_plus_two_double']:
if int(cards_curr[2].split('_')[0]) > int(cards_prev[2].split('_')[0]):
return True, card_type_curr
else:
return False, card_type_curr
else:
if int(cards_curr[0].split('_')[0]) > int(cards_prev[0].split('_')[0]):
return True, card_type_curr
else:
return False, card_type_curr
elif card_type_curr == 'rocket':
return True, card_type_curr
elif card_type_curr == 'joker':
return False, card_type_curr
else:
return False, card_type_curr
```
这样，我们就完成了一个简单的斗地主游戏的编程实现。接下来可以通过加入更多的特性和优化代码来完善这个游戏。
