python获取txt多行文本中的数据，存入到excel

import os
import xlwt
import re
knowledge = []
def write_excel(knowledge):
    # 创建xls工作薄
    workbook = xlwt.Workbook(encoding='utf-8')
    # 创建sheet
    data_sheet = workbook.add_sheet('first')
    for i in range(len(knowledge)):
        data_sheet.write(i, 0, knowledge[i][0])
        data_sheet.write(i, 1, knowledge[i][1])
        data_sheet.write(i, 2, knowledge[i][2])
    # 保存文件
    workbook.save('Report.xls')
x = xlwt.Workbook()
s1 = x.add_sheet('sheet1')

if __name__ == '__main__':
    myfile = open('Message.txt', 'r')
    line = myfile.readline()
    while line:
        #获取行中的数据值
        list=re.findall(r"\d+\.?\d*", line)
        #print (list)
        knowledge.append(list)
        write_excel(knowledge)
        line = myfile.readline()
    myfile.close()