python sheet写入数据

import pandas as pd
from pandas import DataFrame
import openpyxl
from openpyxl import load_workbook
from openpyxl import Workbook
student=pd.read_excel('13.xlsx')
writer = pd.ExcelWriter('12.xlsx','openpyxl')#要写入的路径
book = load_workbook(writer.path)
writer.book = book
student.to_excel(excel_writer=writer,sheet_name="ALLDATA1")#生成新的sheet命名为ALLDATA
writer.save()
writer.close()
print ('处理完成！')