相关疑难解决方法(0)

在Flask 0.11文档之后,我克隆了Flask repo,创建了一个virtualenv,并安装了Flask via pip install flask.我进入examples/flaskr目录,设置FLASK_APP环境变量,然后执行:

flask run

但是,我收到以下错误:

Traceback (most recent call last):
  File "c:\python34\Lib\runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\python34\Lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "D:\GitHub\flask\venv\Scripts\flask.exe\__main__.py", line 9, in <module>
  File "d:\github\flask\venv\lib\site-packages\flask\cli.py", line 478, in main
    cli.main(args=args, prog_name=name)
  File "d:\github\flask\venv\lib\site-packages\flask\cli.py", line 345, in main
    return AppGroup.main(self, *args, **kwargs)
  File "d:\github\flask\venv\lib\site-packages\click\core.py", line 696, in main
    rv = self.invoke(ctx)
  File "d:\github\flask\venv\lib\site-packages\click\core.py", line 1055, in invoke
    cmd_name, cmd, args = self.resolve_command(ctx, …

我正在使用 Flask 和来自http://flask.pocoo.org/docs/1.0/tutorial/factory/ 的教程构建一个 python web 应用程序。我正在从父目录运行烧瓶，但出现以下错误。

(venv) E:\python-code\python-web>flask run
 * Serving Flask app "flaskr" (lazy loading)
 * Environment: development
 * Debug mode: on
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 294-690-396
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [16/Mar/2019 13:10:43] "GET /hello HTTP/1.1" 500 -
Traceback (most recent call last):
  File "e:\python-code\python-web\venv\lib\site-packages\flask\_compat.py", line 35, in reraise
    raise value
  File "e:\python-code\python-web\venv\lib\site-packages\flask\cli.py", line 95, in find_best_app
    module=module.__name__
flask.cli.NoAppException: Failed to find …