第一次按下，两个小灯全亮。2.第二次按下，蓝灯亮，黄灯灭。3.第三次按下，黄灯亮，蓝灯灭。4.第四次按下，两个小灯全灭代码

这似乎是在描述一个简单的状态机或者是按钮控制电路的行为。我们可以用Python编写一段伪代码来表示这个过程：

class LightController:
    def __init__(self):
        self.blue_light = True
        self.yellow_light = False

    def button_press(self, press_number):
        if press_number == 1:
            self.blue_light = True
            self.yellow_light = True
        elif press_number == 2:
            self.blue_light = not self.blue_light
            self.yellow_light = not self.yellow_light
        elif press_number == 3:
            self.blue_light = self.yellow_light
            self.yellow_light = not self.blue_light
        elif press_number == 4:
            self.blue_light = False
            self.yellow_light = False

# 初始化控制器
controller = LightController()

# 模拟按钮按下
for press in [1, 2, 3, 4]:
    controller.button_press(press)
    print(f"Press {press}: Blue light is {'on' if controller.blue_light else 'off'}, Yellow light is {'on' if controller.yellow_light else 'off'}")

在这个例子中，`LightController`类有两个私有变量代表灯的状态，并通过`button_press`方法来更新它们。每次按下按钮，都会改变灯的状态。