python如何聚合多个excel

import xlrd
import xlsxwriter

source_xls = ["D:/python/1.xlsx", "D:/python/2.xlsx"]
target_xls = "D:/python/3.xlsx"

# 读取数据
data = []
for i in source_xls:
    wb = xlrd.open_workbook(i)
    for sheet in wb.sheets():
        for rownum in range(sheet.nrows):
            data.append(sheet.row_values(rownum))
print(data)
# 写入数据
workbook = xlsxwriter.Workbook(target_xls)
worksheet = workbook.add_worksheet()
font = workbook.add_format({"font_size":14})
for i in range(len(data)):
    for j in range(len(data[i])):
        worksheet.write(i, j, data[i][j], font)
# 关闭文件流
workbook.close()