AttributeError：'NoneType'对象在Win10上的PyCharm 2018.3.7中没有正在运行烧瓶脚本的'SSLContext'属性

Question

使用flask运行Hello world脚本：

# coding=utf-8
from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
return "Hello World!"

我收到以下错误：

C:\anaconda3\python.exe C:/anaconda3/Scripts/flask-script.py run
Traceback (most recent call last):
  File "C:/anaconda3/Scripts/flask-script.py", line 9, in <module>
    sys.exit(main())
  File "C:\anaconda3\lib\site-packages\flask\cli.py", line 966, in main
    cli.main(prog_name="python -m flask" if as_module else None)
  File "C:\anaconda3\lib\site-packages\flask\cli.py", line 586, in main
    return super(FlaskGroup, self).main(*args, **kwargs)
  File "C:\anaconda3\lib\site-packages\click\core.py", line 717, in main
    rv = self.invoke(ctx)
  File "C:\anaconda3\lib\site-packages\click\core.py", line 1135, in invoke
    sub_ctx = cmd.make_context(cmd_name, args, parent=ctx)
  File "C:\anaconda3\lib\site-packages\click\core.py", line 641, in make_context
    self.parse_args(ctx, args)
  File "C:\anaconda3\lib\site-packages\click\core.py", line 940, in parse_args
    value, args = param.handle_parse_result(ctx, opts, args)
  File "C:\anaconda3\lib\site-packages\click\core.py", line 1477, in handle_parse_result
    self.callback, ctx, self, value)
  File "C:\anaconda3\lib\site-packages\click\core.py", line 96, in invoke_param_callback
    return callback(ctx, param, value)
  File "C:\anaconda3\lib\site-packages\flask\cli.py", line 742, in _validate_key
    is_context = isinstance(cert, ssl.SSLContext)
AttributeError: 'NoneType' object has no attribute 'SSLContext'

Process finished with exit code 1

PyCharm中的配置应该正确：

烧瓶1.1.1已经安装在anaconda3环境中。我在Win10 Home上使用PyCharm 2018.3.7。

[能否请您帮我解决此问题，或者错误说明了什么？预先谢谢！

Answer 1

[FLASK_APP应该具有烧瓶模块。

flask quickstart将很有帮助。

您需要通过导出FLASK_APP环境变量来告诉终端应用程序可以使用

BTW，pycharm提供了创建Flask应用程序的简便方法。 This link也可以帮助您。

这是我的简单示例。

$ cat hello.py 
from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "hello world"
$ env FLASK_APP=hello.py  flask run
 * Serving Flask app "hello.py"
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit) 
127.0.0.1 - - [12/Apr/2020 12:13:04] "GET / HTTP/1.1" 200 -