code: def csv(args):
      
      from xlrd import open_workbook
  
      p = OptionParser(csv.__doc__)
      p.set_sep(sep=',')
      opts, args = p.parse_args(args)
  
      if len(args) != 1:
          sys.exit(not p.print_help())
  
      excelfile, = args
      sep = opts.sep
      csvfile = excelfile.rsplit(".", 1)[0] + ".csv"
      wb = open_workbook(excelfile)
      fw = open(csvfile, "w")
      for s in wb.sheets():
          print('Sheet:',s.name, file=sys.stderr)
          for row in range(s.nrows):
              values = []
              for col in range(s.ncols):
                  values.append(s.cell(row, col).value)
              print(sep.join(str(x) for x in values), file=fw)
docs: %prog csv excelfile
  
      Convert EXCEL to csv file.