如何在kivy中输入除了浮点型和整型之外的弹出窗口

from kivy.app import App
from kivy.uix.popup import Popup
from kivy.uix.textinput import TextInput

class MyPopup(Popup):
    def __init__(self, **kwargs):
        super(MyPopup, self).__init__(**kwargs)
        self.title = '输入'
        self.content = TextInput(multiline=False)

class MyApp(App):
    def build(self):
        button = Button(text='打开弹出窗口', on_release=self.show_popup)
        return button

    def show_popup(self, button):
        popup = MyPopup()
        popup.open()

if __name__ == '__main__':
    MyApp().run()