NOTEPAD APP KIVY

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from kivy.properties import ObjectProperty, StringProperty

try:
    import os.path
    import json
    import pickle
    from kivy.app import App
    from kivy.lang.builder import Builder
    from kivy.uix.widget import Widget
    from kivy.uix.textinput import TextInput
    from kivy.uix.boxlayout import BoxLayout
    from kivy.uix.screenmanager import Screen, ScreenManager

    screenmanager = """ 

ScreenManager:
    FirstScreen:
    SecondScreen:


<FirstScreen>:



    name: 'first'
    RelativeLayout:
        orientation:'vertical'
        pos: self.pos
        size: root.size
        id: test2
    Button:
        text:'notepad'



        on_press: root.manager.current = 'second'















<SecondScreen>:
    name: 'second'










    RelativeLayout:
        orientation:'vertical'
        pos: self.pos
        size: root.size
        id: test2

        TextInput:
            id:input
            text: str(root.textinput)
            pos_hint: {'center_x': 0.5, 'center_y': 0.705}
            size_hint: 0.95, 0.5









    Button:

        text:'Menu'








        size_hint:1,.2 

        on_press: root.manager.current = 'first'
        on_press: root.print()














    """


    class Switch(App):

        def build(self):
            screen = Builder.load_string(screenmanager)
            return screen


    class FirstScreen(Screen, BoxLayout):

        if os.path.isfile("savedxx"):
            print('file exists')
            load = text = pickle.load(open("savedxx", "rb"))
            textinput = StringProperty(load)
            print(load)
        else:
            print("file does not exist")
            textinput = StringProperty()


    class SecondScreen(Screen, BoxLayout):

        if os.path.isfile("savedxx"):
            print('file exists')
            load = text = pickle.load(open("savedxx", "rb"))
            textinput = StringProperty(load)
            print(load)
        else:
            print("file does not exist")
            textinput = StringProperty()

        def print(self):
            text = self.ids.input.text
            print(text)
            text = pickle.dump(text, open("savedxx", "wb"))


    sm = ScreenManager()
    sm.add_widget(FirstScreen(name='first'))
    sm.add_widget(SecondScreen(name='second'))

    if __name__ == "__main__":
        Switch().run()
except FileNotFoundError:
    pass