Python 如何控制蛇只有两个键，即左键和右键

目前，我使用所有四个键来控制蛇的左、右、上、下方向。我想知道我怎么能只用左右键来移动蛇

                    if event.key == pygame.K_LEFT:
                        snake.direction = 2
                    elif event.key == pygame.K_RIGHT:
                        snake.direction = 3
                    elif event.key == pygame.K_UP:
                        snake.direction = 0
                    elif event.key == pygame.K_DOWN:
                        snake.direction = 1
    def move(self):
        if self.direction is 0:
            self.dy = -self.block
            self.dx = 0
        if self.direction is 1:
            self.dy = self.block
            self.dx = 0
        if self.direction is 2:
            self.dy = 0
            self.dx = -self.block
        if self.direction is 3:
            self.dy = 0
            self.dx = self.block
        self.x += self.dx
        self.y += self.dy

---

有人能指导我怎么做吗

不要根据按键设置方向，而是让左右键通过增加或减少当前方向来调整方向

我还更改了

move

功能，使方向按顺时针顺序排列

                if event.key == pygame.K_LEFT:
                    snake.direction -= 1
                elif event.key == pygame.K_RIGHT:
                    snake.direction += 1

                if snake.direction > 3:
                    snake.direction = 0
                elif snake.direction < 0:
                    snake.direction = 3
def move(self):
    if self.direction is 0:
        self.dy = -self.block
        self.dx = 0
    if self.direction is 1:
        self.dy = 0
        self.dx = -self.block
    if self.direction is 2:
        self.dy = self.block
        self.dx = 0
    if self.direction is 3:
        self.dy = 0
        self.dx = self.block
    self.x += self.dx
    self.y += self.dy

如果event.key==pygame.K_左：
方向-=1
elif event.key==pygame.K_RIGHT:
snake.direction+=1
如果snake.direction>3：
snake.direction=0
elif蛇形方向<0:
方向=3
def移动（自我）：
如果self.direction为0：
self.dy=-self.block
self.dx=0
如果self.direction为1：
self.dy=0
self.dx=-self.block
如果self.direction为2：
self.dy=self.block
self.dx=0
如果self.direction为3：
self.dy=0
self.dx=self.block
self.x+=self.dx
self.y+=self.dy

这将根据蛇之前的移动方向旋转你的蛇

---

定义如下方向：

• 0:上移
• 1：向右移动
• 2:下移
• 3：向右移动

def移动（自）：
如果self.direction为0：
self.dy=-self.block
self.dx=0
如果self.direction为1：
self.dy=0
self.dx=self.block
如果self.direction为2：
self.dy=0
self.dx=-self.block
如果self.direction为3：
self.dy=self.block
self.dx=0
self.x+=self.dx
self.y+=self.dy

按下右键时，将1添加到蛇形方向，按下左键时，将1减去。使用

%

（模）运算符（请参阅）确保结果为rage[0,3]：

如果event.key==pygame.K_左：
snake.direction=（snake.direction-1）%4
如果event.key==pygame.K_RIGHT：
snake.direction=（snake.direction+1）%4

                if event.key == pygame.K_LEFT:
                    if snake.direction == 0
                        snake.direction = 2
                    elif snake.direction == 2
                        snake.direction = 1
                    elif snake.direction == 1
                        snake.direction = 3
                    elif snake.direction == 3
                        snake.direction = 0
                elif event.key == pygame.K_RIGHT:
                    if snake.direction == 0
                        snake.direction = 3
                    elif snake.direction == 3
                        snake.direction = 1
                    elif snake.direction == 1
                        snake.direction = 2
                    elif snake.direction == 2
                        snake.direction = 0
def move(self):
    if self.direction is 0:
        self.dy = -self.block
        self.dx = 0
    if self.direction is 1:
        self.dy = self.block
        self.dx = 0
    if self.direction is 2:
        self.dy = 0
        self.dx = -self.block
    if self.direction is 3:
        self.dy = 0
        self.dx = self.block
    self.x += self.dx
    self.y += self.dy