text: """
  ===============
  Basic pie chart
  ===============
  
  Demo of a basic pie chart plus a few additional features.
  
  In addition to the basic pie chart, this demo shows a few optional features:
  
      * slice labels
      * auto-labeling the percentage
      * offsetting a slice with "explode"
      * drop-shadow
      * custom start angle
  
  Note about the custom start angle:
  
  The default ``startangle`` is 0, which would start the "Frogs" slice on the
  positive x-axis. This example sets ``startangle = 90`` such that everything is
  rotated counter-clockwise by 90 degrees, and the frog slice starts on the
  positive y-axis.
  """
  import matplotlib as mpl
  mpl.use('agg')
  import matplotlib.pyplot as plt
  
  # Pie chart, where the slices will be ordered and plotted counter-clockwise:
  labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
  sizes = [15, 30, 45, 10]
  explode = (0, 0.1, 0, 0)  # only "explode" the 2nd slice (i.e. 'Hogs')
  
  fig1, ax1 = plt.subplots()
  ax1.pie(sizes, explode=explode, labels=labels, autopct='%1.1f%%',
          shadow=True, startangle=90)
  ax1.axis('equal')  # Equal aspect ratio ensures that pie is drawn as a circle.
  
  plt.savefig('test.jpg')
  