我正在为一个项目尝试编写一份自定义版本的Blackjack（二十一点），但KEYDOWN命令没有任何响应，游戏也就跑不起来。我也尝试过通过一个函数来执行同样的命令，或者用一个在按键按下时会变化的条件的while循环，但都没能让它跑起来。

请原谅这个乱糟糟的样子，这只是一个高中项目（所以我不是专业人士），我的首要任务是让它能跑起来。代码里可能夹杂着之前尝试的一些片段，所以如果有些东西看起来完全没用，那很可能就是那样。

import pygame
import random

WINDOW_SIZE = [950, 650]

pygame.init()
screen = pygame.display.set_mode(WINDOW_SIZE)
pygame.display.set_caption("MinusJack")

font1 = pygame.font.Font(None, 25)
font2 = pygame.font.Font(None, 20)

#cards n such
Q = 10
K = 10
J = 10
A = 11
_Q = -10
_K = -10
_J = -10
_A = -11
Deck = [-2,-3,-4,-5,-6,-7,-8,-9,_Q,_K,_J,_A,2,3,4,5,6,7,8,9,Q,K,J,A]
pHand = 0
bHand = 0
runs = ""
running = True
WHITE = ( 255, 255, 255)
RED = ( 200, 0, 0)
#responses
dislose = font1.render("You Lose!", True, RED)
diswin = font1.render("You Win!", True, RED)
distie = font1.render("It's a tie!", True, RED)
disE = font1.render("Easter Egg", True, RED)
dissoon = font1.render("You folded too soon!", True, RED)
disgood = font1.render("Good call", True, RED)

Welcome = font1.render("Welcome to minusjack! Try to get to 21 before the bot does, but beware of the minuscards.",True, WHITE)
blank = ""
instruc = font1.render("For instructions, press i",True, WHITE)
screen.blit(Welcome, [10, 50])
screen.blit(instruc, [10, 100])
gamepl = font1.render("Press ENTER to draw. Press f to fold", True, RED)
screen.blit(gamepl, [10,150])
pygame.display.update()

keys = pygame.key.get_pressed()

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if keys[pygame.K_i]:
                i1 = font2.render("When Enter is hit, you receive a card. The card can have a positive or negative number. This card is added to your hand.",True, WHITE)
                i2 = font2.render("If all cards in your hand add to hand 21, you win!",True, WHITE)
                i3 = font2.render("But beware: you play against a bot. If it reaches 21 before you, you lose.",True, WHITE)
                i4 = font2.render("The bounds are 40 and -30. Do not let your hand leave these.",True, WHITE)
                i5 = font2.render("If it does, you lose. Same goes for the bot.",True, WHITE)
                i6 = font2.render(" *Technical things: Q/K/K = 10, A = 11",True, WHITE)
                i7 = font2.render("The goal is to try to get as close to 21 as possible. If you think you're closer than the bot, fold.",True, WHITE)
                i8 = font2.render("Good luck!",True, RED)
                screen.blit(i1, [10, 200])
                screen.blit(i2, [10, 220])
                screen.blit(i3, [10, 240])
                screen.blit(i4, [10, 260])
                screen.blit(i5, [10, 280])
                screen.blit(i6, [10, 300])
                screen.blit(i7, [10, 320])
                screen.blit(i8, [10, 340])
            elif keys[pygame.K_RETURN]:
                #playerdraw
                pNewcard = random.choice(Deck)
                dispNewcard = font1.render("New card: ", str(pNewcard), True, WHITE)
                screen.blit(dispNewcard, [10,100])
                #playerhand
                pHand =  pHand + pNewcard
                dispHand = font1.render("Your hand: ", str(pHand), True, WHITE)
                screen.blit(dispHand, [50, 100])
                #botdraw
                bNewcard = random.choice(Deck)
                #bothand
                bHand = bHand + bNewcard
                disbHand = font1.render("Bot hand: ", str(bHand), True, WHITE)
                #win/lose
                if bHand == 21 and pHand == 21 or pHand == -21 and bHand == -21 or pHand == 21 and bHand == -21 or pHand == -21 and bHand == 21: #happened once
                    screen.blit(dispHand, [20, 200])
                    screen.blit(disbHand, [20, 220])
                    print("..huh?")
                    break
                elif bHand == 21: #b win
                    screen.blit(dispHand, [20, 200])
                    screen.blit(disbHand, [20, 220])
                    screen.blit(dislose, [30, 240])
                    break
                elif pHand == 21: #p win
                    screen.blit(dispHand, [20, 200])
                    screen.blit(disbHand, [20, 220])
                    screen.blit(diswin, [30, 240])
                    break
                elif pHand == -21 or bHand == -21:
                    screen.blit(dispHand, [20, 200])
                    screen.blit(disbHand, [20, 220])
                    screen.blit(disE, [30, 240])
                    break
                elif bHand > 40 and pHand > 40 or bHand > 40 and pHand < -30 or bHand < -30 and pHand > 40 or bHand < -30 and pHand < -30: #exceed
                    screen.blit(dispHand, [20, 200])
                    screen.blit(disbHand, [20, 220])
                    screen.blit(distie, [30, 240])
                    break
                elif bHand > 40 or bHand < -30: #b exceed
                    screen.blit(dispHand, [20, 200])
                    screen.blit(disbHand, [20, 220])
                    screen.blit(diswin, [30, 240])
                    break
                elif pHand > 40 or pHand < -30: #p exceed
                    screen.blit(dispHand, [20, 200])
                    screen.blit(disbHand, [20, 220])
                    screen.blit(dislose, [30, 240])
                    break
                else:
                    screen.blit(gamepl, [10,150])
            elif keys[pygame.K_f]:
                screen.blit(dispHand, [20, 200])
                screen.blit(disbHand, [20, 220])
                if bHand - 21 < pHand - 21 and pHand < 21 and bHand < 21: #<21
                    screen.blit(disgood, [30, 240])
                elif bHand - 21 > pHand - 21 and pHand < 21 and bHand < 21:
                    screen.blit(dissoon, [30, 240])
                elif bHand - 21 > pHand - 21 and pHand > 21 and bHand > 21: #>21
                    screen.blit(disgood, [30, 240])
                elif bHand - 21 < pHand - 21 and pHand > 21 and bHand > 21:
                    screen.blit(dissoon, [30, 240])
                elif ((bHand - 21)*-1) > pHand - 21 and pHand > 21 and bHand < 21: #b<21
                    screen.blit(disgood, [30, 240])
                elif ((bHand - 21)*-1) < pHand - 21 and pHand > 21 and bHand < 21:
                    screen.blit(dissoon, [30, 240])
                elif bHand - 21 > ((pHand - 21)*-1) and pHand < 21 and bHand > 21: #b>21
                    screen.blit(disgood, [30, 240])
                elif bHand - 21 < ((pHand - 21)*-1) and pHand < 21 and bHand > 21:
                    screen.blit(dissoon, [30, 240])
                else:
                    screen.blit(distie, [30, 240])
            else:
                runs == ""

pygame.display.update()

pygame.quit()

解决方案

据我所知：.get_pressed() 如果你不先运行 pygame.event.get() 就不起作用（因为 event.get() 会更新在 .get_pressed() 中使用的特殊数组）。

如果你想获得关于按键的实际信息，那么必须在 while-循环中进行——它会更新这个数组。

但是如果把它放在 if event.type == pygame.KEYDOWN: 中运行，那么 if event.key == pygame.K_i: 就更有意义。

if event.type == pygame.KEYDOWN:
   if event.key == pygame.K_i:
      # code
   elif event.key == pygame.K_RETURN:
      # code
   elif event.key == pygame.K_f:
      # code

顺便说一句，.get_pressed() 在 for event-循环之后更有用，当你想要一直检查按键是否处于按下状态时——它可以一遍又一遍重复同样的代码，直到你松开按键（例如按住箭头键来移动对象）。当你只是想执行某段代码一次时，它就没用了。