import sys
import tkinter as tk

from random import randint
from tkinter import messagebox

def roll_die(sides):
  n = randint(1, sides)
  messagebox.showinfo(title='Liczba to:', message=n)

class GUI:
  def __init__(self, master):
    self.master = master
    self.draw_buttons()

  def draw_buttons(self):
    dice_sides = [4, 6, 8, 12, 20, 100]
    for n in dice_sides:
      button = tk.Button(self.master,
                         text='Wylosuj kostka {}'.format(n),
                         command=lambda: roll_die(n))
      button.pack()

    quit_button = tk.Button(self.master,
                            text='Koniec',
                            command=sys.exit)
    quit_button.pack()

root = tk.Tk()
gui = GUI(root)
root.mainloop()