我在 Ubuntu 上运行相同的代码没有问题，但在 Windows10 上运行时出现问题。我还安装了 Flask。我的windows环境配置如下：
$ pip --version
pip 21.1.1 from c:\users\min\appdata\local\programs\python\python37\lib\site-packages\pip (python 3.7)
$ pip show flask
Name: Flask
Version: 2.0.0
Summary: A simple framework for building complex web applications.
Home-page: https://palletsprojects.com/p/flask
Author: Armin Ronacher
Author-email: armin.ronacher@active-4.com
License: BSD-3-Clause
Location: c:\users\min\appdata\local\programs\python\python37\lib\site-packages
Requires: Werkzeug, itsdangerous, Jinja2, click
Required-by: Flask-RESTful, Flask-API
$ pip show flask-restful
Name: Flask-RESTful
Version: 0.3.8
Summary: Simple framework for creating REST APIs
Home-page: https://www.github.com/flask-restful/flask-restful/
Author: Twilio API Team
Author-email: help@twilio.com
License: BSD
Location: c:\users\min\appdata\local\programs\python\python37\lib\site-packages
Requires: Flask, …