Show output of print function in interface?

Dash Python
1

I have a setup where a user clicks a button, and a long process starts running based on a function call from a callback. I.E.:

 def long_running_function():
    print("Output here.")
    print("Output here too.")
   @app.callback(Output('yada','yada'),
                     [Input('button','n_clicks')])
def run_process():
   long_running_function()

Is there a way to display the print calls from the long_running_function in the Dash interface in realtime so the user knows a process is happening, and what it is?

2

print would print the line to stdout. It won’t appear in the dash app.

3

You’d need some kind of server side store (like Redis) or implement a queue for users tasks. You send the messages from the long running tasks to the queue, a dcc.Interval callback fetch the messages from the queue and output them.

4

Here is an elegant solution to this problem:
https://stackoverflow.com/questions/70200820/python-dash-concurrently-updating-an-element-within-a-callback