Flask failure

[Elismar Luz]

 Address already in use!

On Fri, Jun 15, 2018 at 12:19 PM, T Berger <brgrt2 at gmail.com> wrote:

> I’m trying to build a webapp with flask. I installed flask, created a
> webapp in IDLE, but when I tried testing it at my terminal, I got a huge
> error message. This is the app:
>
> from flask import Flask
> app = Flask(__name__)
> @app.route('/')
> def hello() -> str:
>     return 'Hello world from Flask!'
> app.run()
>
> This is my command and the resulting error message, containing a warning
> in red:
>
> Last login: Thu Jun 14 23:54:55 on ttys000
> 192:~ TamaraB$ cd Desktop/Webapp/
> 192:Webapp TamaraB$ python3 hello_flask.py
>  * Serving Flask app "hello_flask" (lazy loading)
>  * Environment: production
>    WARNING: Do not use the development server in a production environment.
>    Use a production WSGI server instead.
>  * Debug mode: off
> Traceback (most recent call last):
>   File "hello_flask.py", line 6, in <module>
>     app.run()
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/
> python3.6/site-packages/flask/app.py",
> line 943, in run
>     run_simple(host, port, self, **options)
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/
> python3.6/site-packages/werkzeug/serving.py",
> line 814, in run_simple
>     inner()
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/
> python3.6/site-packages/werkzeug/serving.py",
> line 774, in inner
>     fd=fd)
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/
> python3.6/site-packages/werkzeug/serving.py",
> line 660, in make_server
>     passthrough_errors, ssl_context, fd=fd)
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/
> python3.6/site-packages/werkzeug/serving.py",
> line 577, in __init__
>     self.address_family), handler)
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/
> python3.6/socketserver.py",
> line 453, in __init__
>     self.server_bind()
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/
> python3.6/http/server.py",
> line 136, in server_bind
>     socketserver.TCPServer.server_bind(self)
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/
> python3.6/socketserver.py",
> line 467, in server_bind
>     self.socket.bind(self.server_address)
> OSError: [Errno 48] Address already in use
> 192:Webapp TamaraB$
>
> What went wrong?
> --
> https://mail.python.org/mailman/listinfo/python-list
>



-- 
<http://elismarluz.com>Elismar Luz
GNU/Linux Admin
(61) 99400-3376