Output messages from for loop while callback running

[chriddyp]

@mpalaiokostas

I can print the loop number and see it in the console, but I would like to present this to the user as well. Is there a way to print the progress of a callback?

It isn’t. The best solution to this would be for the client to ping the backend periodically (using the dcc.Interval component). See Boilerplate Heroku Dash App for Long Processes (show and tell) - #4 by astautz for one approach created by a community member.