if event.type == pygame.MOUSEBUTTONDOWN:
    print event.button

event.button可以等于多个整数值:

event.button can equal several integer values:

1-左键单击

2-中键

3-右键单击

4-向上滚动

5-向下滚动

代替事件，您还可以获取当前按钮状态:

Instead of an event, you can get the current button state as well:

pygame.mouse.get_pressed()

这将返回一个元组:

(左键单击，中键单击，右键单击)

(leftclick, middleclick, rightclick)

每个都是代表按钮上/下的布尔整数.

Each one is a boolean integer representing button up/down.