Python Code Error with Tkinter? -

when try run code gives me nasty error:

exception in tkinter callback  traceback (most recent call last):   file "c:\python33\lib\tkinter\__init__.py", line 1475, in __call__     return self.func(*args)   file "e:\tkinter\count_num_challenge.py", line 39, in count_num     num in range(start, end): typeerror: 'entry' object cannot interpreted integer 

please don't know wrong! tried int() around entry did not work either if guys can me out great. in need of assistance

from tkinter import *  class application(frame):     def __init__(self, master):         super(application, self).__init__(master)         self.grid()         self.create_widgets()      def create_widgets(self):         # create instruction label         label(self,               text = "enter starting number ending number."               ).grid(row = 0, column = 0, sticky = w)          # create entry box starting/ending         self.starting_num = entry(self)         self.starting_num.grid(row = 2, column = 0, sticky = w)          self.ending_num = entry(self)         self.ending_num.grid(row = 3, column = 0, sticky = w)          # create text box         self.result_txt = text(self, width = 20, height = 10, wrap = word)         self.result_txt.grid(row = 4, column = 0, columnspan = 1)          # submit button         button(self,                text = "count numbers",                command = self.count_num                ).grid(row = 5, column = 0, sticky = w)      def count_num(self):         start = self.starting_num         end = self.ending_num          num in range(start, end):             print(num)          self.result_txt.delete(0.0, end)         self.result_txt.insert(0.0, count_num)      # main root = tk() root.title("count numbers") app = application(root) root.mainloop() 

in code, self.starting_num instance of entry widget, trying use if number error message telling you.

i'm going guess intent use value of entry widget, in case need use start=int(self.starting_num.get()), though need handle case entry emply or has non-digits in it. same goes ending_num