title: Drawing on tkinter canvas from command line
body: <p>I read some tutorial (basic) on tkinter and learned how to create a mainloop and add gui elements to that. Also learned how to bind actions to button widgets.</p>
  
  <p>Now I would like to do this: </p>
  
  <ol>
  <li>launch the tkinter canvas</li>
  <li>be able to read command from the console and update the canvas after those commands.</li>
  </ol>
  
  <p>example:
  I write command with arguments on the console and some graphics elements is being added to the canvas (and canvas is updated after).</p>
  
  <p>Is something possible, maybe threding related?
  Can you point me in one direction which you think is the most reasonable to follow?</p>