python - 为什么我的 print() 命令在控制台中显示 double ？

Question

下面是我正在处理的一些代码，它们将 double 打印到 CMD 窗口。我看到 double 并不是什么大问题，我只是担心随着这个程序的发展，它迟早会变成一个更大的问题。

这是当我左键单击时 CMD 向我显示的示例:

Left mouse pressed at (451, 279)
Left mouse pressed at (451, 279)
Left mouse released at (451, 279)
Left mouse released at (451, 279)

为了简洁起见，我省略了很多代码，并将其精确定位到这些类和函数。我提前道歉 - 我对这个网站和 python 很陌生。

class Button:       
    def whichButton(self):
        #this function takes the mousebuttondown event, and returns WHICh button is pressed
        if self.button == 1:
            return "Left"
        if self.button == 2:
            return "Middle"
        if self.button == 3:
            return "Right"
        if self.button == 4:
            return "Wheel Up"
        if self.button == 5:
            return "Wheel Down"     

    def handleEvent(self, event):

        if event.type == pygame.MOUSEBUTTONDOWN:
            print( Button.whichButton(event)+' mouse pressed at ' + str(event.pos))
            if self.rect.collidepoint(event.pos):
                self.buttonDown = True
                self.image = self.imageDown

class Game:
    self.all_sprites.add(self.startButton, self.quitButton)
    def run(self):
        while not self.done:
            self.frameRate = self.clock.tick(60) / 1000
            self.handleEvent()


    def handleEvent(self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                self.done = True
            for button in self.all_sprites:
                button.handleEvent(event)




if __name__ == '__main__':
    pygame.init()
    Game(screen).run()
    pygame.quit()

Answer 1

发生这种情况是因为您在 for 循环中为 self.all_sprites 组中的每个按钮调用 button.handle_event(event)，所以您正在打印 print( Button.whichButton(event)+' mouse pressed at ' + str(event.pos)) 每个按钮。

def handle_events(self):
    for event in pg.event.get():
        if event.type == pg.QUIT:
            self.done = True
        # Iterates over all buttons in the group and calls their `handle_event` method.
        for button in self.all_sprites:
            button.handle_event(event)