运行一个 Dash 应用时名称或服务未知

Question

我的设置非常简单，但无法运行。我怀疑它与服务器地址有关（我认为它应该是 https://127.0.0.1:8050）但不知道如何更改它。任何建议高度赞赏。 - 设置虚拟环境并安装 dash（使用 pip install dash）。它也安装了 flask。

我的应用基本设置：

import dash
import dash_html_components as html

app = dash.Dash()

app.layout = html.Div(
    html.H1(children="Hello World!")
)

if __name__ == '__main__':
    app.run_server(debug=True)

当我在终端中运行我的应用程序时，出现以下错误：

(Dash) rene@ideapad:~/Projects/Dash$ python my_app.py 
Running on http://x86_64-conda_cos6-linux-gnu:8050/
Debugger PIN: 287-942-334
 * Serving Flask app "my_app" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: on
Traceback (most recent call last):
  File "my_app.py", line 12, in <module>
    app.run_server(debug=True)
  File "/home/rene/Environments/Dash/lib/python3.7/site-packages/dash/dash.py", line 1973, in run_server
    self.server.run(host=host, port=port, debug=debug, **flask_run_options)
  File "/home/rene/Environments/Dash/lib/python3.7/site-packages/flask/app.py", line 990, in run
    run_simple(host, port, self, **options)
  File "/home/rene/Environments/Dash/lib/python3.7/site-packages/werkzeug/serving.py", line 1030, in run_simple
    s.bind(server_address)
socket.gaierror: [Errno -2] Name or service not known

Answer 1

我通过手动设置主机和端口解决了这个问题：

if __name__ == '__main__':
    app.run_server(host='127.0.0.1', port='8050', debug=True)

但我仍然不知道为什么它开始使用 http://x86_64-conda_cos6-linux-gnu:8050。

有什么建议吗？

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