How to allow users to download an excel file using python/Flask?

import os
from flask import send_file
@app.route('/downlaod')
def downloadExcel():
    root_path = "path_to_your_file"
    filename = "your_file_name.xlsx"
    file_path = os.path.join(root_path, filename)
    return send_file(file_path)

def process_xl(filename):

    wb = load_workbook(filename=filename)

    sheet_1 = wb['Sheet1']
    sheet_2 = wb['Sheet2']

    city_1 = sheet_1['A1'].value
    city_2 = sheet_2['']
    wb.save(filename)