python - 在 IIS 上部署plotly dash

Question

我正在尝试将一个绘图破折号部署到 IIS。
首先，我按照链接中的说明进行操作:
Flask on IIS - James Polera
然后当我使用这个脚本时它就可以工作:

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello from FastCGI via IIS!"

if __name__ == "__main__":
    app.run()

但是当我使用这个脚本时，它不适用于破折号:

import dash
import dash_core_components as dcc
import dash_html_components as html

app = dash.Dash()

app.layout = html.Div(children=[html.H1('Hello Dash!'),
                                html.Div('Dash: Web Dashboard with python'),
                                dcc.Graph(id='example',
                                        figure={'data':[
                                            {'x':[1,2,3],'y':[4,1,3],'type':'bar','name':'SF'},
                                            {'x':[1,2,3],'y':[2,4,5],'type':'bar','name':'NYC'}
                                                        ],
                                                'layout':{'title':'BAR PLOTS'}
                                                })
                                ])

if __name__ == "__main__":
    app.run_server()

我收到此错误:

Error occurred while reading WSGI handler:

Traceback (most recent call last):
  File "C:\inetpub\wwwroot\mysite\wfastcgi.py", line 791, in main
    env, handler = read_wsgi_handler(response.physical_path)
  File "C:\inetpub\wwwroot\mysite\wfastcgi.py", line 633, in read_wsgi_handler
    handler = get_wsgi_handler(os.getenv("WSGI_HANDLER"))
  File "C:\inetpub\wwwroot\mysite\wfastcgi.py", line 600, in get_wsgi_handler
    handler = __import__(module_name, fromlist=[name_list[0][0]])
  File "C:\inetpub\wwwroot\mysite\app.py", line 1, in <module>
    import dash
  File "C:\ProgramData\Anaconda3\lib\site-packages\dash\__init__.py", line 1, in <module>
    from .dash import Dash, no_update  # noqa: F401
  File "C:\ProgramData\Anaconda3\lib\site-packages\dash\dash.py", line 23, in <module>
    import plotly
  File "C:\ProgramData\Anaconda3\lib\site-packages\plotly\__init__.py", line 30, in <module>
    from plotly import (
  File "C:\ProgramData\Anaconda3\lib\site-packages\plotly\graph_objs\__init__.py", line 100161, in <module>
    import ipywidgets
  File "C:\ProgramData\Anaconda3\lib\site-packages\ipywidgets\__init__.py", line 23, in <module>
    from IPython import get_ipython
  File "C:\ProgramData\Anaconda3\lib\site-packages\IPython\__init__.py", line 55, in <module>
    from .terminal.embed import embed
  File "C:\ProgramData\Anaconda3\lib\site-packages\IPython\terminal\embed.py", line 15, in <module>
    from IPython.core.interactiveshell import DummyMod, InteractiveShell
  File "C:\ProgramData\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 64, in <module>
    from IPython.utils import io
  File "C:\ProgramData\Anaconda3\lib\site-packages\IPython\utils\io.py", line 94, in <module>
    stdin = IOStream(sys.stdin, fallback=devnull)
  File "C:\ProgramData\Anaconda3\lib\site-packages\IPython\utils\io.py", line 38, in __init__
    for meth in filter(clone, dir(stream)):
  File "C:\ProgramData\Anaconda3\lib\site-packages\IPython\utils\io.py", line 37, in clone
    return not hasattr(self, meth) and not meth.startswith('_')
  File "C:\ProgramData\Anaconda3\lib\site-packages\IPython\utils\io.py", line 81, in closed
    return self.stream.closed
ValueError: underlying buffer has been detached

有人可以帮忙，这两天我一直在努力寻找解决方案。
谢谢

Answer 1

您应该公开 Flask 对象，而不是 Dash 对象。因此代码会是这样的，

import dash
import dash_core_components as dcc
import dash_html_components as html
from flask import Flask

server = Flask(__name__)  # object to be referenced by WSGI handler
app = dash.Dash(server=server)

app.layout = html.Div(children=[html.H1('Hello Dash!'),
                                html.Div('Dash: Web Dashboard with python'),
                                dcc.Graph(id='example',
                                        figure={'data':[
                                            {'x':[1,2,3],'y':[4,1,3],'type':'bar','name':'SF'},
                                            {'x':[1,2,3],'y':[2,4,5],'type':'bar','name':'NYC'}
                                                        ],
                                                'layout':{'title':'BAR PLOTS'}
                                                })
                                ])

if __name__ == "__main__":
    app.run_server()

请注意，在我的代码示例中，Flask 应用程序对象称为 server。因此，根据我的命名约定，WSGI_HANDLER 值应更改为 app.server。