tkinter

[Larz60+]

without digging into your code, I provide a simple polling example:

import tkinter as tk

class Polling:
    def __init__(self, parent):
        self.parent = parent

        self.parent.geometry('100x100+10+10')
        self.txt = tk.Text(parent)
        self.txt.pack(fill=tk.BOTH)
        self.toggle = True

    def myevent(self):
        # Note from Larz60+
        # you can add your own code here.
        # I'll just print message for simplicity
        if self.toggle:
            self.txt.insert(tk.END, 'tick\n')
            self.toggle = False
        else:
            self.txt.insert(tk.END, 'tock\n')
            self.toggle = True

    def poller(self):
        self.myevent()
        self.txt.after(2000, self.poller) # 2 seconds

def main():
    root = tk.Tk()
    poll = Polling(root)
    poll.poller()
    root.mainloop()

if __name__ == '__main__':
    main()