Python - Kivy - ScrollableLabel

import kivy
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen

# --- data ---

you_shall_not_pass = ['de', 'o','a', 'do', 'da', 'em', 'e', 'que', 'ser', 'um', 'uns', 'uma', 'umas', 'por','para', 'nao', 'com', 'se', 'ter', 'seu', 'sua', 'seus', 'suas','como',
 'estar','sim', '-', 'os', 'as', 'no', 'ao', 'na', '.', 'mas', 'era', 'lhe', 'ele', 'mais','dos', 'ela', 'ele', 'muito','ja','eu','sobre','das','tinha','quando','sem','la','num',
 'depois','entao','nos','esta','ainda','numa','onde','foi','tao','estava','entre','dum','so','grande','disse','todo','pela','agora','pelo','me','toda', 'havia', 'tudo', 'ou','ate',
 'ha','nem','logo','ia','sempre','duas','tambem','mesmo','ali','aos','tem','fora','aquele','tu','meu','duma','aquela','e,','outra','essa','outro','isto','esse','assim','quem','ele,',
 'apenas','todos','pouco','nas','diante','ai','sob','tinham','coisas','aqui','pois','porque','ir','te','nunca','depois','lado','tres','mao','vez','sim,','desde','isso','fazer','este']

# --- classes ---


from kivy.uix.scrollview import ScrollView
from kivy.properties import StringProperty
from kivy.lang import Builder

Builder.load_string('''
<ScrollableLabel>:
    Label:
        size_hint_y: None
        height: self.texture_size[1]
        text_size: self.width, None
        text: root.text
''')

class ScrollableLabel(ScrollView):
    text = StringProperty('')

# --- classes ---

class LoginScreen(GridLayout):

    def __init__(self, **kwargs):
        super(LoginScreen, self).__init__(**kwargs)

        self.cols = 2

        self.add_widget(Label(text='Livro1:'))
        self.bookone = TextInput(multiline=False)
        self.add_widget(self.bookone)

        self.add_widget(Label(text='Livro2:'))
        self.booktwo = TextInput(multiline=False)
        self.add_widget(self.booktwo)


        self.add_widget(Button(text='Submit1', on_press=self.callback))
        self.add_widget(Button(text='Submit2', on_press=self.callback))


        self.debug_label = ScrollableLabel()
        self.add_widget(self.debug_label)

        # --- class object ---

        self.total = 0

        self.livro1 = 'erro'
        self.livro2 = 'batata.txt'

        self.dicionario = {}
        self.dicionario2 = {}

    def callback(self, args):

        print('[DEBUG] args:', args)
        print('[DEBUG] args.text:', args.text)

        if args.text == 'Submit1':
            self.livro1 = self.bookone.text + '.txt'

            self.debug_label.text += 'livro1: {}\n'.format(self.livro1)

            self.palavras_repetidas()
        elif args.text == 'Submit2':
            self.livro1 = self.bookone.text + '.txt'
            self.livro2 = self.booktwo.text + '.txt'

            self.debug_label.text += 'livro1: {}\n'.format(self.livro1)
            self.debug_label.text += 'livro2: {}\n'.format(self.livro2)

            self.palavras_repetidas()
            self.comparar()
        else:
            txt = '???'


    def comparar(self):

        lista2 = open(self.livro2, 'r').read().split()

        for word in lista2:
            if word in you_shall_not_pass:
                continue
            if word in self.dicionario2:
                self.dicionario2[word] += 1
            else:
                self.dicionario2[word] = 1

        #for key in dicionario.keys():
        #   if key in dicionario2.keys():
        #       if (dicionario[key]>10 and dicionario2[key]>10):
        #           print(key, dicionario[key], dicionario2[key])######################################################

        common_keys = set(self.dicionario.keys()) & set(self.dicionario2.keys())
        print(common_keys)

        for key in common_keys:
            a = self.dicionario[key]
            b = self.dicionario2[key]
            if a > 10 and b > 10:
                #print(key, a, b)
                self.debug_label.text += '{}: {}, {}\n'.format(key, a, b)
            self.debug_label.text += '{}: {}, {}\n'.format(key, a, b)

    def palavras_repetidas(self):

        lista = open(self.livro1, 'r').read().split()

        for word in lista:
            if word in you_shall_not_pass:
                continue
            if word in self.dicionario:
                self.dicionario[word]+=1
            else:
                self.dicionario[word] = 1

        #sorted_dict = [(k,v) for v,k in sorted([(v,k) for k,v in dicionario.items()],reverse=True)]

        sorted_dict = sorted(self.dicionario.items(), reverse=True, key=lambda d:d[1])

        print(sorted_dict)

        #with open('teste.txt', 'w') as f:##############################################################################
        #    for item in sorted_dict:
        #        f.write(str(item))

        for item in sorted_dict:
            self.debug_label.text += '{}: {}\n'.format(*item)

    def palavras_totais(self):

        f = open(self.livro1, 'r').read().split()

        for word in f:
            self.total += 1

        self.debug_label.text += 'total: {}\n'.format(self.total)


class MyApp(App):

    def build(self):
        return LoginScreen()

MyApp().run()