在python中下载XLSX

Question

当用户按如下所示访问URL时，我试图返回xlsx文件，

from flask import Flask
from flask_restful import Api, Resource, reqparse
import pandas as pd
import numpy as np
import pymysql
import xlsxwriter

app = Flask(__name__)
api = Api(app)


    class genGraph(Resource):

        def get(self,day):
                writer = pd.ExcelWriter('E:/report2.xlsx', engine='xlsxwriter')
                i=1
                sheet1 = pd.read_sql_query(query, connection)
                columns = list(sheet1['areaName'].values.flatten())

                sheet1.to_excel(writer,'Sheet%d'%(i), startrow=0, startcol=0)
                workbook = writer.book
                worksheet = writer.sheets['Sheet%d'%(i)]
                col_length = len(sheet1.T.columns)
                genGraph.format_worksheet(worksheet)
                chart = workbook.add_chart({'type' : 'column'})
                worksheet.insert_chart('C1', chart)   

            return 'Report Generated' #Here how to return that report2.xlsx file???

    api.add_resource(genGraph, '/create/chart/<string:day>')
    if __name__ == '__main__':
        app.run(debug=True)

我要返回创建的文件，而不是返回字符串。

我如何有效地实现这一目标？