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我想使用 curses.KEY_UP 和 curses.KEY_DOWN 使用我创建的函数来增加和减少索引。我的处理程序可以使用任何键，但使用向上和向下键时似乎不起作用。

import npyscreen, curses


index = 0
class MyTestApp(npyscreen.NPSAppManaged):
    def onStart(self):
        self.registerForm("MAIN", MainForm())

class MainForm(npyscreen.Form):
    def create(self):

    

        for i in range(10):
            self.add(npyscreen.FixedText, value='message:'+str(i))
            
        
        self.add_handlers({"^R": self.spawn_notify_popup,
                            curses.KEY_UP: self.minus_one,
                            curses.KEY_DOWN: self.add_one})


    def add_one(self, key):
        global index
        if(index < 30):
            index+=1
        
    def minus_one(self, key):
        global index
        if(index > 0):
            index-=1   
          
            
    
    def spawn_notify_popup(self, code_of_key_pressed):
        message_to_display = 'I popped up passed: {}'.format(index)
        npyscreen.notify_confirm(message_to_display, title= 'title')
        
    
            
    def afterEditing(self):
        self.parentApp.setNextForm(None)

if __name__ == '__main__':
    TA = MyTestApp()
    TA.run()
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