title: how to link a button to another .py file in python2.7
body: <p>How do I link a python button?</p>
  
  <p>Basically I want a python button to execute another python file. </p>
  
  <p>I am using Tk.</p>
  
  <p>I've created this button and would like it to execute the script</p>
  
  <pre><code>from Tkinter import *
  import Tkinter as tk
  root = tk.Tk()
  
      b = Button(toolbar, text="Travelling", width=9 )
      b.pack(side=LEFT, padx=2, pady=2)
  
  mainloop()
  </code></pre>
  
  <p>How do I make this button execute another python script on click?</p>