keypad pastebin

i try on the dock free mode and Virtual. setup_mode
but know how to use them and call them in the code
and is similar with to set validation my password and confirm password as Special character ,number, small and big alphabets


from kivy.config import Config
Config.set('kivy', 'keyboard_mode', 'multi')
from kivymd.app import MDApp
from kivy.lang import Builder
from kivymd.uix.screen import MDScreen
from kivy.uix.screenmanager import ScreenManager
from kivymd.uix.textfield import MDTextFieldRound
from kivy.properties import NumericProperty
from kivy.core.window import Window


#import json



KV=('''


<REGITRATION_Window>:
    name:'regitration_window1'
    #RelativeLayout:

    MDToolbar:
        title: 'About'
        elevation: 10
        left_action_items: [['arrow-left', lambda x: app.change_screen('login_window1')]]
        pos_hint: {"left":1, "top":1}


    MDLabel:
        text: 'Full Name'
        font_size: 15
        pos_hint : {'x':0.0322, 'y':0.35}

    mainkeypad:
        max_characters: 70
        hint_text: 'For Eg:- xxx yyy zzz'
        pos_hint : {'x':0.0322, 'y':0.790}
        size_hint : 0.6, .045


    MDLabel:
        text: 'Country Code '
        font_size: 15
        pos_hint : {'x':0.0322, 'y':0.272}

    NumericInput:
        max_characters: 3
        int_text: 'For Eg:- +91'
        pos_hint : {'x':0.0322, 'y':0.710}
        size_hint : 0.09, .045

    MDLabel:
        text: 'Mobile Number'
        font_size: 15
        pos_hint : {'x':0.305, 'y':0.272}

    NumericInput:
        max_characters: 10
        hint_text: 'For Eg:- 987654321'
        pos_hint :{'x':0.305, 'y':0.710}
        size_hint : 0.35, .045


    MDLabel:
        text: 'Location'
        font_size: 15
        pos_hint : {'x':0.0322, 'y':0.190}

    mainkeypad:
        max_characters: 70
        hint_text: 'For Eg:- kalyan'
        pos_hint : {'x':0.0322, 'y':0.630}
        size_hint : 0.6, .045

    MDLabel:
        text: 'Pin Code'
        font_size: 15
        pos_hint : {'x':0.0322, 'y':0.11}

    mainkeypad:
        max_characters: 7
        hint_text: 'For Eg:- 400050'
        pos_hint : {'x':0.0322, 'y':0.550}
        size_hint : 0.6, .045

    MDLabel:
        text: 'City/Town/Village'
        font_size: 15
        pos_hint : {'x':0.0322, 'y':0.03}

    mainkeypad:
        max_characters: 70
        hint_text: 'For Eg:- Mumbai'
        pos_hint : {'x':0.0322, 'y':0.470}
        size_hint : 0.6, .045

    MDLabel:
        text: 'District/Taluka'
        font_size: 15
        pos_hint : {'x':0.0322, 'y':-0.05}

    mainkeypad:
        max_characters: 70
        hint_text: 'For Eg:- Mumbai'
        pos_hint : {'x':0.0322, 'y':0.390}
        size_hint : 0.6, .045



    MDLabel:
        text: 'State'
        font_size: 15
        pos_hint : {'x':0.0322, 'y':-0.13}

    mainkeypad:
        max_characters: 70
        hint_text: 'For Eg:- Maharashtra'
        pos_hint : {'x':0.0322, 'y':0.310}
        size_hint : 0.6, .045


    MDLabel:
        text: 'Country'
        font_size: 15
        pos_hint : {'x':0.0322, 'y':-0.21}

    mainkeypad:
        max_characters: 70
        hint_text: 'For Eg:- India'
        pos_hint : {'x':0.0322, 'y':0.230}
        size_hint : 0.6, .045



    MDLabel:
        text: 'Password'
        font_size: 15
        pos_hint : {'x':0.0322, 'y':-0.29}

    mainkeypad:
        max_characters: 70

        hint_text: 'For Eg:-   sdsddssd'
        pos_hint : {'x':0.0322, 'y':0.150}
        size_hint : 0.6, .045



    MDLabel:
        text: 'Confirm Password'
        font_size: 15
        pos_hint : {'x':0.0322, 'y':-0.37}

    mainkeypad:
        max_characters: 70

        hint_text: 'For Eg:- SSdssds'
        pos_hint : {'x':0.0322, 'y':0.070}
        size_hint : 0.6, .045



    MDFillRoundFlatButton:
        text:'REGISTER'
        pos_hint: {'x':.1, 'y':.1}
    MDFillRoundFlatButton:
        text:'Cancel'
        pos_hint: {'x':.3, 'y':.1}


WindowManager:
    REGITRATION_Window:
        id: key_num

            ''')


class REGITRATION_Window(MDScreen):
    pass
    #def open_keypad(self):
        #self.root.ids.key_num.ids.data_layout.add_widget(self.setup_keyboard)

class WindowManager(ScreenManager):
    pass


class NumericInput(MDTextFieldRound):
    max_characters = NumericProperty()

    def __init__(self, **kwargs):
        super().__init__(input_filter=self.char_limit, **kwargs)

    def on_focus(self, instance_text_field, focus_value: bool):
        # on focus request a numeric keyboard
        if focus_value:
            num_kb = Window.request_keyboard(self.close_key, self)
            if num_kb.widget:
                num_kb.widget.layout = 'numeric.json'

    def close_key(self):
        pass

    def char_limit(self, substring, from_undo):
        if len(self.text) < self.max_characters:
            return substring

class mainkeypad(MDTextFieldRound):

    def __init__(self, **kwargs):
        super().__init__(input_filter=self.char_limit, **kwargs)

        Window.request_keyboard(self._keyboard_closed, self.text)


    def _keyboard_closed(self):
        pass


    def char_limit(self, substring, from_undo):
        if len(self.text) < self.max_characters:
            return substring






class MainApp(MDApp):
    def build(self):
        return Builder.load_string(KV)


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