title: How to draw arc (part of circle) in python
body: <p>I want to have 360 PNG bitmaps, each bitmap is an arc, and presents for a step in a progress. The following bitmaps present for step 60 (60 degree from top) and step 120.</p>
  
  <p><a href="https://i.stack.imgur.com/JZIxE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JZIxE.png" alt="Step 60"></a>
  <a href="https://i.stack.imgur.com/wRb1K.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wRb1K.png" alt="Step 120"></a></p>
  
  <p>How to draw these bitmaps in code? </p>
  
  <p><strong>Edit:</strong> I can draw it now but do not know how to set the start point at top instead of bottom</p>
  
  <pre><code>import turtle
  wn = turtle.Screen
  turtle.hideturtle()
  turtle.hideturtle()
  turtle.ht()
  turtle.speed(0)
  
  turtle.pensize(11)
  turtle.color("grey")
  turtle.circle(200)
  
  turtle.color("red")
  turtle.circle(200, 60, 3600)
  
  cv = turtle.getcanvas()
  cv.postscript(file="circle.ps", colormode='color')
  
  turtle.done()
  </code></pre>