#! /usr/bin/env python3
from tkinter import Tk, Canvas

class Sudoku_menu(Tk):
    'Mini application to demonstrate the failing of Control-2.'    
    def __init__(self):
        # initialze Tk itself
        Tk.__init__(self)
        # Canvas
        self.c = Canvas(self, width=122, height=122, bg="white")
        self.c.grid(row=0)
        #define binding for Control-<numeric> keys
        for i in range(0, 10):  # control-1 .. control-9
            self.c.bind( bytes("<Control-Key-" + str(i) + ">", 'utf-8'),
                lambda x=str(i): self.key_control_num(x))
        self.c.focus_set()

    def key_control_num(self, event):
        'Control-0 .. Control-9 has been pressed'
        print("key_control_num", event.keysym)
        if event.keysym == '0':
            self.quit()

# initialize the application class
app = Sudoku_menu()
# start dispatcher
app.mainloop()