python 实现在Excel末尾增加新行

import osimport xlrdimport xlwtfrom xlutils.copy import copydef excelwrite(L=None):if L is None:	L = []print(L)filename = r'wldata.xls'workbook = xlrd.open_workbook(filename, formatting_info=True)sheet = workbook.sheet_by_index(0)rowNum = sheet.nrowscolNum = sheet.ncolsnewbook = copy(workbook)newsheet = newbook.get_sheet(0)# 在末尾增加新行str = 'hehe'newsheet.write(rowNum, 0, str)# 覆盖保存newbook.save(filename)