for line in gab_ofc: gab.append(line.split()[0][-1]) gab_ofc.close() for i in range(0, 20): if gab[i] == gabarito_aluno[i].text.lower(): nota += 1 else: erradas.append(i + 1) gabarito_aluno = [] sm.switch_to(sm.screen_1) sm = ScreenManager(transition=FadeTransition()) sm.screen_1 = (Header(name='main')) sm.screen_2 = Aluno(name='aluno') sm.add_widget(sm.screen_1) sm.add_widget(sm.screen_2) class Gabarito(App): def build(self): global nota global erradas page = sm return page if __name__ == '__main__': a = Gabarito()