Kivy Login example

.gitignore

*.pyc

connected.kv

<Connected>:
    BoxLayout:
        orientation: 'vertical'

        Label:
            text: "You are now connected"
            font_size: 32
        Button:
            text: "Disconnect"
            font_size: 24
            on_press: root.disconnect()

connected.py

from kivy.app import App
from kivy.uix.screenmanager import Screen, SlideTransition

class Connected(Screen):
    def disconnect(self):
        self.manager.transition = SlideTransition(direction="right")
        self.manager.current = 'login'
        self.manager.get_screen('login').resetForm()

login.kv

#:include connected.kv

<Login>:
    BoxLayout
        id: login_layout
        orientation: 'vertical'
        padding: [10,50,10,50]
        spacing: 50

        Label:
            text: 'Welcome'
            font_size: 32

        BoxLayout:
            orientation: 'vertical'

            Label:
                text: 'Login'
                font_size: 18
                halign: 'left'
                text_size: root.width-20, 20

            TextInput:
                id: login
                multiline:False
                font_size: 28

        BoxLayout:
            orientation: 'vertical'
            Label:
                text: 'Password'
                halign: 'left'
                font_size: 18
                text_size: root.width-20, 20

            TextInput:
                id: password
                multiline:False
                password:True
                font_size: 28

        Button:
            text: 'Connexion'
            font_size: 24

            on_press: root.do_login(login.text, password.text)

main.py

from kivy.app import App
from kivy.properties import StringProperty
from kivy.uix.screenmanager import ScreenManager, Screen, SlideTransition
import os

from connected import Connected

class Login(Screen):
    def do_login(self, loginText, passwordText):
        app = App.get_running_app()

        app.username = loginText
        app.password = passwordText

        self.manager.transition = SlideTransition(direction="left")
        self.manager.current = 'connected'

        app.config.read(app.get_application_config())
        app.config.write()

    def resetForm(self):
        self.ids['login'].text = ""
        self.ids['password'].text = ""

class LoginApp(App):
    username = StringProperty(None)
    password = StringProperty(None)

    def build(self):
        manager = ScreenManager()

        manager.add_widget(Login(name='login'))
        manager.add_widget(Connected(name='connected'))

        return manager

    def get_application_config(self):
        if(not self.username):
            return super(LoginApp, self).get_application_config()

        conf_directory = self.user_data_dir + '/' + self.username

        if(not os.path.exists(conf_directory)):
            os.makedirs(conf_directory)

        return super(LoginApp, self).get_application_config(
            '%s/config.cfg' % (conf_directory)
        )

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

Priyanshthehacker you didnt create that connected.py file wich imports this

awsome dude thnks a lot