main.py

from kivy.app import App
import xml.etree.ElementTree
from kivy.uix.screenmanager import ScreenManager, Screen

class Gerenciador_01(ScreenManager):
    pass

class XML(object):

    arquivo_xml_create_python = open("dev_dados.xml", "w")

    XML = """
    <App>
        <desenvolvedor>
            <dados>
                <nome name="Gabriel"></nome>
                <numero number="19 99108-0219"</numero>
                <email email="gschimidit@gmail.com"></email>
            </dados>
            <info>
                <sobre_01  "V1.0"></sobre_01>
                <sobre_02 objective="None"></sobre_02>
                <sobre_03 config="False"></sobre_03>
            </info>
        </desenvolvedor>
    </App>
        """
    arquivo_xml_create_python.write(XML)
    arquivo_xml_create_python.close()

    pass

class main(App):

    def Security(self):

        username = self.root.ids.username_enter.text
        password = self.root.ids.password_enter.text

        if username == "Gabriel" and password == "38753363":
            pass

    def build(self):
        return Gerenciador_01()

main().run()