title: Graphs in xlsx File overwrite by openpyxl
body: <p>We need to update xlsx sheet using python script which do some calcualtion and update one worksheet.
  I choose openpyxl as it supoort writing/updating xlsx File.
  In the Excel sheet contain some graphs also but When I update excel sheet than graph does not work
  into excel and data update respectively.
  I think we had some issue for updating graph with openpyxl.Can anyone provide me some input to fix this issue</p>
  
  <p>or In other word,In the Excel sheet I have 10 worksheet.In worksheet 1, it contain graphs. I have updated worksheet number 5. Worksheet is updated successfully. But I have loose the graphs of worksheet 1.</p>
  
  <pre><code>#!/usr/bin/env python
  from openpyxl import load_workbook
  import openpyxl 
  print "pylx"
  ddr_sam45_flop =  "Flip_Flop.xlsx"
  flop_workbook     = load_workbook(ddr_sam45_flop)
  raw_flop_workbook = flop_workbook.get_sheet_by_name(name ='RAW')
  raw_flop_workbook.cell(row = 1 , column = 1).value = 889999
  flop_workbook.save(ddr_sam45_flop)
  print "End"
  </code></pre>
  
  <p>(Please consider me new to openpyxl)</p>