问如何使用烧瓶响应返回TXT文件？

EN

xml version="1.0" encoding="UTF-8"?
html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "XHTML1-s.dtd"

AssertionError: applications must write bytes

During handling of the above exception, another exception occurred:

...

TypeError: 'NoneType' object is not callable

from flask import Flask, render_template, request, Response, make_response
import script2

app = Flask(__name__)

@app.route('/')
def display_home():
    return render_template("home.html")

@app.route('/upload', methods=["GET", "POST"])
def upload_and_run():
    uploaded_file = request.files['file']
    file_name = uploaded_file.filename
    file_contents = uploaded_file.stream.read().decode("utf-8")
    result = script2.run_script_in_web_app(file_name, file_contents)

    response = app.response_class(response=result, status=200, mimetype='application/txt')
    return response

if __name__ == '__main__':
  app.run()

def run_script_in_web_app(filename, file_contents):

    global soup

    name = filename

# Convert the HTML file contents into a Beautiful Soup object. 

    soup = BeautifulSoup(file_contents)
    return soup

# Creates a dictionary that contains an "author" value extracted from the HTML input file.

    extracted_authors = parse_authors(soup)

# Pulls contents from "header" divs with a certain ID in the input file.

    parse_headers(soup)

# Pulls contents from "body" divs with a certain ID in the input file. 

    parse_bodies(soup)

# Creates a list of dictionaries from header div contents. 

    extracted_heads = extract_headers(header_divs)

# Creates a list of dictionaries from body div contents. 

    extracted_bodies = extract_body(body_divs)

# Combines the header and body dictionaries together into a single list of dictionaries. 

    heads_and_bodies = merge_heads_with_bodies(extracted_heads, extracted_bodies)

# Writes the list of dictionaries and the "author" dictionary together in a .txt file for display to the end user. 

    output_file = dict_writer(extracted_authors, heads_and_bodies, name)
    return (output_file)