从下拉菜单中选择波特率，在python shell中连续显示串行数据

Question

我正在尝试创建下拉菜单，并通过从下拉列表中选择正确的波特率，数据应在python shell和消息框中显示串行端口数据，

下面提到的是我的代码：

============== RESTART: C:\Users\Misha\Desktop\test\dropTest.py ==============
Traceback (most recent call last):

      File "C:\Users\Misha\Desktop\test\dropTest.py", line 31, in <module>
        ard.baudrate = drop
    NameError: name 'drop' is not defined

但是在运行这段代码时，我遇到了一些错误，

import android.content.Context
import android.view.GestureDetector
import android.view.MotionEvent
import android.view.View

abstract class OnHorizontalSwipeListener(val context: Context) : View.OnTouchListener {    

    companion object {
         const val SWIPE_MIN = 50
         const val SWIPE_VELOCITY_MIN = 100
    }

    private val detector = GestureDetector(context, GestureListener())

    override fun onTouch(view: View, event: MotionEvent) = detector.onTouchEvent(event)    

    abstract fun onRightSwipe()

    abstract fun onLeftSwipe()

    private inner class GestureListener : GestureDetector.SimpleOnGestureListener() {    

        override fun onDown(e: MotionEvent) = true

        override fun onFling(e1: MotionEvent, e2: MotionEvent, velocityX: Float, velocityY: Float)
            : Boolean {

            val deltaY = e2.y - e1.y
            val deltaX = e2.x - e1.x

            if (Math.abs(deltaX) < Math.abs(deltaY)) return false

            if (Math.abs(deltaX) < SWIPE_MIN
                    && Math.abs(velocityX) < SWIPE_VELOCITY_MIN) return false

            if (deltaX > 0) onRightSwipe() else onLeftSwipe()

            return true
        }
    }
}

我从各个方面进行了尝试，但无法解决。任何有关运行此代码的建议都会有很大帮助。