AttributeError：'NoneType'对象在Win10上的PyCharm 2018.3.7中没有运行烧瓶脚本的属性'SSLContext' [英] AttributeError: 'NoneType' object has no attribute 'SSLContext' running flask script in PyCharm 2018.3.7 on Win10

问题描述

使用flask运行Hello world脚本：

Running the Hello world script using flask:

# 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：

Configuration in PyCharm should be correct:

烧瓶1.1.1已安装在anaconda3中环境。
Im在Win10 Home上使用PyCharm 2018.3.7。

Flask 1.1.1 already installed in anaconda3 environment. Im using PyCharm 2018.3.7 on Win10 Home.

能否请您帮我解决此问题，或者错误说明了什么？

Could you please help me how to fix this or what does the error says? Thank you in advance!

推荐答案

FLASK_APP 应该具有烧瓶模块。

FLASK_APP should have your flask module.

烧瓶快速入门会有所帮助。

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

you need to tell your terminal the application to work with by exporting the FLASK_APP environment variable

顺便说一句，pycharm提供了创建flask应用程序的简便方法。 此链接也会为您提供帮助。

BTW, pycharm provides easy way to create flask app. This link also helps you.

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 -

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