Why can't I rerun the function? How to solve it?

Question

Python

Hello! I'm trying to run two functions in parallel, but when I call the get_mail_func() function, which displays unread messages, I get the error: imaplib.IMAP4.error: command LOGIN illegal in state LOGOUT, only allowed in states NONAUTH.
Here is the class code:

class DialogMenu(tk.Toplevel):
    def __init__(self,user_name):
        super().__init__(root)
        self.user_name = user_name
        self.db = db
        self.get_mail_class_start = get_mail_class_start
        self.send_mail = Mail_class(user_name, smtplib.SMTP('smtp.gmail.com:587'))
        self.db.cur = self.db.conn.cursor()
        self.init_dialog()
        self.mail_thread()





    def retrieve_message_input(self):
        self.messsage_text = self.Message_Text.get(1.0, tk.END)
        self.send_mail.send_mail(self.messsage_text)
 
    def init_dialog(self):
        
        self.geometry('600x550')
        self.resizable(False,False)
        self['bg'] = '#2A3132'
        self.minsize(width = 900, height = 550) 
        self.title(f'Диалог с {self.user_name}')
 
        server = 'smtp.gmail.com:587'
        self.send_mail.start_client(server)
        
        self.Send_btn = tk.Button(self,text = '',padx=15,pady=12.5,bd=5,font=('Ubuntu',35),
                             bg = '#336B87',command = partial(self.dialog_db,self.user_name))
 
        self.Send_btn_sms = tk.Button(self,text = '➤',padx = 15,pady = 13,font = ('Ubuntu',35),bd = 5,
                                      bg = '#336B87', command = self.retrieve_message_input)
 
        self.Message_Text = tk.Text(self,width = 45,height = 5,bg='white',fg='black',font = 50)
        self.frame = tk.Frame(self)
        self.text = tk.Text(self.frame, width=85, height=22)
        self.scroll = tk.Scrollbar(self.frame, command=self.text.yview)
        self.scroll.pack(side=tk.RIGHT, fill=tk.Y)
        self.text.config(yscrollcommand=self.scroll.set)
        self.text.insert(tk.INSERT,("text" + '\n') * 50)
        self.text.configure(state='disabled')
 
        self.text.pack(side=tk.TOP) 
        self.text.place()
 
        self.frame.pack(side=tk.TOP)
        self.Send_btn.pack()
        self.Send_btn_sms.pack()
        self.Message_Text.pack()
 
        self.Send_btn.place(x = 670,y = 400)
        self.Send_btn_sms.place(x = 545, y = 400)
        self.Message_Text.place(x = 34,y = 400)
  
    def dialog_db(self, user_name):
        DialogDB(user_name)

    def mail_thread(self):
        time.sleep(1)
        self.after(True,get_mail_class_start.get_mail_func())

And here is the function code:

class get_mail_class():
    def __init__(self, mail, send_mail):
        self.send_mail = send_mail
        self.mail = mail
    



    def get_mail_func(self):
        (retcode, capabilities) = self.mail.login('*******','*******')
        self.mail.list()
        self.mail.select('INBOX')
        
        my_file = open('text.txt', 'a+')
        
        n=0
        (retcode, messages) = self.mail.search(None, '(UNSEEN)')
        if retcode == 'OK':
            for num in messages[0].split():
                n=n+1
                typ, data = self.mail.fetch(num,'(RFC822)')
                for response_part in data:
                    if isinstance(response_part, tuple):
                        original = email.message_from_bytes(response_part[1])
                        # print (original['From'])
                        # print (original['Subject'])
                        raw_email = data[0][1]
                        raw_email_string = raw_email.decode('utf-8')
                        email_message = email.message_from_string(raw_email_string)
                        typ, data = self.mail.store(num,'+FLAGS','\\Seen')
 
                        if email_message.is_multipart():
                            for payload in email_message.get_payload():
                                body = payload.get_payload(decode=True).decode('utf-8')
                                print(original['From'])
                                print(body)
                                my_file.write((f"\n {body}"))
                                
                        
                        else:    
                            body = email_message.get_payload(decode=True).decode('utf-8')
                            print(original['From'])
                            print(body)      
                            my_file.write((f"\n {body}"))
                            
            self.mail.close()
            self.mail.logout()
        else:
            self.mail.logout()
            self.mail.close()

Thanks in advance!

Answer 1

Do you have a line in your function?

(retcode, capabilities) = self.mail.login('*******','*******')

And when you call for the first time, you log in and everything is fine, but when you call it for the second time, it tries to log in again, but when you are already authorized, you cannot log in again (this is what is written in the error)
Solution: log in to the init

(self.retcode, self.capabilities) = self.mail.login('*******','*******')