title: TkInter Tk() not working
body: <p>I have much experience with Python, but I'm just now learning Tkinter and the following code isn't working:</p>
  
  <pre><code>root = Tk()
  root.mainloop()
  </code></pre>
  
  <p>It spits out the error message
  "NameError: name 'Tk' is not defined"</p>