title: How to plot a pie chart with the first wedge on top, in Python? [matplotlib]
body: <p>How can a pie chart be drawn with Matplotlib with a first wedge that starts at noon (i.e. on the top of the pie)?  The default is for <code>pyplot.pie()</code> to place the first edge at three o'clock, and it would be great to be able to customize this.</p>