xls -> xlsx 로 변환

xlsFile = 'test.xls'
excel = win32.Dispatch('Excel.Application')
excel.Visible = True
load_wb = excel.Workbooks.Open(os.path.abspath(xlsFile))
load_wb.SaveAs(xlsFile.replace('.xls','.xlsx'), FileFormat = 51)
excel.Application.Quit()