Both python and Qt have been upgraded between stretch and buster, as
such you have to expect changes in behavior.

From what you said, it doesn't seem to be breaking.

On 4/10/20 00:45, Marc Shapiro via Dng wrote:
> I have a program written in Python 3 that uses a .ui file from QT
> Designer.  This is the exact same program and .ui file as I used in
> Debian.  (It is in /usr/local/bin, which I mount in both places.)  It
> retrieves stock data for up to 30 ticker symbols and runs the data
> through various calculations before displaying the results in a separate
> set of fields for each symbol.
>
> When I run this under Debian Stretch, as each symbol is processed the
> results are displayed for that ticker, until I reach the end of the list.
>
> When I run it under Devuan Beowulf, no results are displayed until it is
> done with all of the tickers and then all the fields are filled in and
> displayed at one.
>
> Have there been changes in the way python and QT Designer interact? 
> Under Stretch, /usr/bin/python3 points to python3.5, in Beowulf, it
> points to python3.7.  Could this be causing the different behavior.  I
> can't just change the link, because I get an error loading the QT module
> when I link to python3.5.
>
> Marc