How to access variables from another function

Kivy needs to access the 'v_pb' and 'max_email' variables from the 'def sendMail (listing):' function. While only mastering python

def sendMail(listing): v_pb = 0 HOST = listing[0] SUBJECT = listing[1] FROM = listing[2] userName = listing[3] passWord = listing[4] fileText = listing[5] s_email = listing[6].split() server = smtplib.SMTP_SSL(HOST, 465) server.login(userName, passWord) max_email = len(s_email) for i in s_email: msg = MIMEMultipart() msg['From'] = FROM msg['Subject'] = SUBJECT msg['To'] = str(i) msg.attach(MIMEText(fileText, 'plain')) server.send_message(msg) v_pb +=1 server.quit() class SendlerApp(App): def build(self): gl = GridLayout() host_txt = TextInput(multiline=False) sub_txt = TextInput(multiline=False) from_txt = TextInput(multiline=False) user_txt = TextInput(multiline=False) pass_txt = TextInput(multiline=False) msg_txt = TextInput(font_size=24) mail_txt = TextInput(font_size=24) btn_start = Button(text="Start",on_press=lambda *a: sendMail( listing=(host_txt.text, sub_txt.text, from_txt.text, user_txt.text, pass_txt.text, msg_txt.text, mail_txt.text))) progress_bar = ProgressBar(max=max_email, size_hint=(1, .1)) # получить доступ к этой переменной из def sendMail(listing): progress_bar.value = v_pb # получить доступ к этой переменной из def sendMail(listing): gl.add_widget(host_txt) gl.add_widget(sub_txt) gl.add_widget(from_txt) gl.add_widget(user_txt) gl.add_widget(pass_txt) gl.add_widget(msg_txt) gl.add_widget(mail_txt) bl2.add_widget(btn_start) gl.add_widget(progress_bar) return gl if __name__ == '__main__': SendlerApp().run()