how to add button in tkinter

import Tkinter
import tkMessageBox

top = Tkinter.Tk()

def helloCallBack():
   tkMessageBox.showinfo( "Hello Python", "Hello World")

B = Tkinter.Button(top, text ="Hello", command = helloCallBack)

B.pack()
top.mainloop()

import tkinter as tk
import random


def color(ndex):
    button_label_list[ndex][1].config(bg="#%06x" % random.randint(0, 16777215))


def dump():
    global count, button_label_list
    button_label_list.append([tk.Button(frame, text="color", command=lambda x=count: color(x)),
                              tk.Label(frame, text="Color", bg="#" + ("%06x" % random.randint(0, 16777215)))])
    button_label_list[-1][0].grid(row=0, column=count, sticky='nsew')
    button_label_list[-1][1].grid(row=1, column=count, sticky='nsew')
    frame.columnconfigure(count, weight=1)
    count += 1


root = tk.Tk()
count = 0
button_label_list = []
root.title("Hello")
root.rowconfigure(1, weight=1)
root.columnconfigure(2, weight=1)

frame = tk.Frame(root)
frame.rowconfigure(1, weight=1)
frame.grid(row=0, column=2, sticky='nsew', rowspan=2)

tk.Button(root, text="butt ON", command=dump).grid(row=0, column=0, sticky='nsew')
tk.Button(root, text="Quit!", command=root.quit).grid(row=0, column=1, sticky='nsew')
tk.Label(root, text="This is a label", bg="PeachPuff").grid(row=1, column=1, columnspan=1, sticky='nsew')

root.mainloop()