Why does my dash app structure calculates the data twice?

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I have a dash apllication and the following 4 Modules. app needs to be imported from dashboard.py and tab_OIA.py as both modules work with app. This is also the way recommended by the plotly dash website:

  • app.py:

    import dash
app = dash.Dash(__name__,suppress_callback_exceptions=True)

  • dashboard.py:

    from app import app 
from tab_OIA import tab_OIA_layout
    .
    .
    .
if __name__ == '__main__':
app.run_server(debug=True, threaded=True)

  • tab_OIA.py:

    from app import app 
import data

tab_OIA_layout = html.Div(.....)

@app.callback()
def function():
   return ..

  • data.py:

    import pandas 
*calculate stuff*
print("Everything calculated")

When I run dashboard.py in cmd it shows the following and "Everything calculated" appears twice:

C:\Users\.spyder-py3>python dashboard.py
Everything calculated
Running on http://127.0.0.1:8050/
Debugger PIN: 111-463-400
 * Serving Flask app "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
Everything calculated
Running on http://127.0.0.1:8050/
Debugger PIN: 101-604-170

Calculating the data twice takes a lot of time. Why does that happen? Is there a way to avoid that?

plotly-dash module python
1 Answers

You import app.py twice. To fix this, try removing from app import app from dashboard.py.

#from app import app 
from tab_OIA import *
    .
    .
    .
if __name__ == '__main__':
app.run_server(debug=True, threaded=True)
user_141041860
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