在Flask中返回Excel文件

Question

我正在python 3中构建一个烧瓶应用程序。我正在尝试写入输出并响应下载。我所做的就是将sqlite3 db内容写入一个excel文件，试图发送到客户端进行下载。在创建excel文件之前，一切似乎都正常工作。我无法发送给客户。

@app.route('/download', methods=['GET'])
def export_db():
    values = execute("SELECT * from table",[])
    wb = Workbook()
    ws = wb.active

    for item in values.fetchall():
        ws.append(item)
    wb.save('example.xlsx')

    output = make_response(wb)
    output.headers["Content-Disposition"] = "attachment; filename=" + 
    "example.xlsx"
    output.headers["Content-type"] = "application/vnd.openxmlformats-
    officedocument.spreadsheetml.sheet"
    return output

我收到的错误信息是，

Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1612, 
in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1598, 
in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/user/Documents/main.py", 
line 218, in export_db
output = make_response(wb)
File "/usr/local/lib/python3.5/dist-packages/flask/helpers.py", line 
191, in make_response
return current_app.make_response(args)
File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1740, 
in make_response
rv = self.response_class.force_type(rv, request.environ)
File "/usr/local/lib/python3.5/dist-packages/werkzeug/wrappers.py", 
line 911, in force_type
response = BaseResponse(*_run_wsgi_app(response, environ))
File "/usr/local/lib/python3.5/dist-packages/werkzeug/wrappers.py", 
line 59, in _run_wsgi_app
return _run_wsgi_app(*args)
File "/usr/local/lib/python3.5/dist-packages/werkzeug/test.py", line 
884, in run_wsgi_app
app_rv = app(environ, start_response)
TypeError: 'Workbook' object is not callable

我提到了几个类似的问题，但似乎都没有帮助。任何帮助将不胜感激。

注意：当我尝试将文件路径添加到make_response时，它将文件路径作为字符串，并返回一个文件路径为内容的.xlsx文件。任何想法我做错了什么？

Answer 1

这样的事情应该有效：

from flask import send_file
from xlsxwriter import Workbook

@app.route('/download', methods=['GET'])
def export_db():
    values = execute("SELECT * from table",[])
    wb = Workbook('path/to/workbook.xlsx')
    wb.add_worksheet('All Data')

    for item in values.fetchall():
        wb.write(item)
    wb.close()

    return send_file('path/to/workbook.xlsx')