title: How to draw smily (arc) using python turtle
body: <p>I want to draw a smily using python turtle. Circle extent will be 120. 
  I am trying following </p>
  
  <pre><code>import turtle
  turtle.circle(100)
  turtle.up()
  turtle.goto(0, 30)
  turtle.down()
  turtle.circle(40, 120)
  </code></pre>
  
  <p>Problem is smile part. How to draw a face smile?</p>