Python3.4版Spyder中运行Dash简易仪表盘时初始化报错求助

Hey there, let's work through the issues you're hitting with your Dash app in Python 3.4 and Spyder. I spot a couple of key problems right away:

1. Your code has incomplete syntax #

Looking at the snippet you shared, there are unclosed brackets and truncated data in your dcc.Graph figure. That's definitely throwing errors. Here's a fixed, complete version of your code:

import dash
import dash_core_components as dcc
import dash_html_components as html

# Adding __name__ helps avoid issues when deploying later
app = dash.Dash(__name__)  

app.layout = html.Div(children=[
    html.H1(children='Hello Dash'),
    html.Div(children='''
        Dash: A web application framework for Python.
    '''),
    dcc.Graph(
        id='example-graph',
        figure={
            'data': [
                {'x': [1, 2, 3], 'y': [4, 1, 2], 'type': 'bar', 'name': 'San Francisco'},
                {'x': [1, 2, 3], 'y': [2, 4, 5], 'type': 'bar', 'name': 'Montréal'},
            ],
            'layout': {
                'title': 'Dash Data Visualization'
            }
        }
    )
])

if __name__ == '__main__':
    # Run the server with debug mode for easier testing
    app.run_server(debug=True)

2. Python 3.4 is way too old for modern Dash #

Python 3.4 reached end-of-life back in 2019, and almost all recent Dash versions drop support for it. This is probably a big reason your app is failing even if you fix the syntax.

• Best fix: Upgrade your Python version to 3.7 or newer (3.8-3.11 are the most stable for Dash right now). This will let you use the latest Dash features and avoid compatibility headaches.
• If you must stick with 3.4: Install older, compatible versions of the Dash packages with this command:

pip install dash==1.21.0 dash-core-components==1.17.1 dash-html-components==1.1.4

3. Spyder-specific quirks to watch for #

When running Dash apps in Spyder, sometimes the automatic browser pop-up doesn't work. Try these:

• Check Spyder's IPython console settings: Go to Tools > Preferences > IPython console > Graphics and set the backend to something other than "Inline" (like "Qt5").
• After running your code, look for the local server URL in the console (usually http://127.0.0.1:8050/) and manually paste it into your browser—this works more reliably than relying on Spyder to open it for you.

内容的提问来源于stack exchange，提问作者Matt W.