如何在kivy中使用屏幕管理器在另一个python文件中运行python文件？

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder

# 定义一个屏幕类
class FirstScreen(Screen):
    pass

class SecondScreen(Screen):
    pass

class ScreenManagement(ScreenManager):
    pass

# 加载Kivy的布局文件
Builder.load_file("screens.kv")

# 创建一个继承自App类的应用程序类
class MyApp(App):
    def build(self):
        return ScreenManagement()

# 运行应用程序
if __name__ == "__main__":
    MyApp().run()

ScreenManagement:
    FirstScreen:
    SecondScreen:

<FirstScreen>:
    name: "first"
    BoxLayout:
        orientation: "vertical"
        Label:
            text: "这是第一个屏幕"
        Button:
            text: "进入第二个屏幕"
            on_release: app.root.current = "second"

<SecondScreen>:
    name: "second"
    BoxLayout:
        orientation: "vertical"
        Label:
            text: "这是第二个屏幕"
        Button:
            text: "返回第一个屏幕"
            on_release: app.root.current = "first"

from kivy.app import App
from kivy.uix.button import Button

# 创建一个继承自App类的应用程序类
class OtherApp(App):
    def build(self):
        return Button(text="这是另一个Python文件")

# 运行应用程序
if __name__ == "__main__":
    OtherApp().run()

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.utils import platform

# 定义一个屏幕类
class FirstScreen(Screen):
    def run_other_python_file(self):
        if platform == "android":
            import android
            android.open_url("python://" + "other.py")
        else:
            import subprocess
            subprocess.Popen(["python", "other.py"])

class SecondScreen(Screen):
    pass

class ScreenManagement(ScreenManager):
    pass

# 加载Kivy的布局文件
Builder.load_file("screens.kv")

# 创建一个继承自App类的应用程序类
class MyApp(App):
    def build(self):
        return ScreenManagement()

# 运行应用程序
if __name__ == "__main__":
    MyApp().run()

ScreenManagement:
    FirstScreen:
    SecondScreen:

<FirstScreen>:
    name: "first"
    BoxLayout:
        orientation: "vertical"
        Label:
            text: "这是第一个屏幕"
        Button:
            text: "进入第二个屏幕"
            on_release: app.root.current = "second"
        Button:
            text: "运行另一个Python文件"
            on_release: root.run_other_python_file()

<SecondScreen>:
    name: "second"
    BoxLayout:
        orientation: "vertical"
        Label:
            text: "这是第二个屏幕"
        Button:
            text: "返回第一个屏幕"
            on_release: app.root.current = "first"