Here is the entire code snippet of the same. Please help
def change_flag(top_frame, bottom_frame, button1, button2, button3, button4, controller): global counter, canvas, my_image, chosen, flag, directory canvas.delete('all') button5['state'] = DISABLED counter += 1 chosen, options_text = function_options() right_answer_flag = get_right_answer_flag(chosen, options_text) #pdb.set_trace() try: location = directory + chosen + format_image except: controller.show_frame(PlayAgainExit) my_image = PhotoImage(file=location) canvas.create_image(160, 100, anchor=CENTER, image=my_image) button1["text"] = options_text[0] button2["text"] = options_text[1] button3["text"] = options_text[2] button4["text"] = options_text[3] button1['state'] = NORMAL button2['state'] = NORMAL button3['state'] = NORMAL button4['state'] = NORMAL ############## button5 = Button( next_frame, width=20, text="next", fg="black", #command=lambda: change_flag(top_frame,bottom_frame,button1,button2,button3,button4,controller)) command=Thread(target=change_flag, args =(top_frame,bottom_frame,button1,button2,button3,button4,controller)).start) button5.pack(side=RIGHT, padx=5, pady=5) Thanks, Abhay -- https://mail.python.org/mailman/listinfo/python-list