Python-сообщество

#/usr/bin/env python3
from tkinter import Frame
from tkinter import Tk
from tkinter import Label
from tkinter import Entry
from tkinter import Button
from tkinter import END
import random
import string
class Application(Frame):
    def __init__(self, master):
        Frame.__init__(self, master)
        self.grid()
        self.create_widgets()
    def create_widgets(self):
        self.label_of_key = Label(self, text='Key:')
        self.label_of_key.grid(row=0, column=0)
        self.entry_of_key = Entry(self, width=19, state='readonly')
        self.entry_of_key.grid(row=0, column=1)
        self.button_of_generate = Button(self,
                                         text='Generate',
                                         command=self.generate_key)
        self.button_of_generate.grid(row=0, column=2)
    def generate_key(self):
        self.key = ''.join(random.choice(
            string.ascii_uppercase + string.digits) for i in range(15))
        self.formatted_key = self.key[0:5] + '-' + self.key[
            5:10
        ] + '-' + self.key[10:15]
        self.entry_of_key.configure(state='normal')
        self.entry_of_key.delete(0, END)
        self.entry_of_key.insert(0, self.formatted_key)
        self.entry_of_key.configure(state='readonly')
root = Tk()
root.iconbitmap('icon.gif')
root.title('Steam key generator')
root.resizable(0, 0)
app = Application(root)
root.mainloop()

import tkinter as tk
#
root = tk.Tk()

if __name__ == "__main__":
    root = Tk()
    root.iconbitmap('icon.gif')
    root.title('Steam key generator')
    root.resizable(0, 0)
    app = Application(root)
    root.mainloop()

self.formatted_key = self.key[0:5] + '-' + self.key[
            5:10
        ] + '-' + self.key[10:15]