title: how to add the chart/graph to worksheet/excelsheet using python
body: <p>I have created the chart using pychart but the output is coming in the form of pdf/png/ps etc .. but i need these chart should come into the excel sheet. what is the way to extract this chart to worksheet. </p>
  
  <pre><code>from pychart import *
  import sys
  def to_percents(data):
      total = float(sum(v for _, v in data))
      data[:] = [(k, v / total) for k, v in data]
      return data
  
  data = [("foo", 10),("bar", 20), ("baz", 30), ("ao", 40)]
  theme.use_color = True
  theme.get_options()    
  ar = area.T(size=(150,150), legend=legend.T(),
              x_grid_style = None, y_grid_style = None)
  
  plot = pie_plot.T(data=data, arc_offsets=[0,0,0,0],
                    shadow = (0, 0, fill_style.gray50),
                    label_offset = 25,
                    arrow_style = arrow.a3)
  ar.add_plot(plot)
  ar.draw()
  </code></pre>