Update main.py

[KmBase]

from multiprocessing import freeze_support is used to provide support for freezing the execution environment when using the multiprocessing module in a Python program that is to be packaged with pyinstaller on Windows systems.

without freeze_support, when a child process is spawned in Windows, it might re-import and re-execute the code that creates the child processes, leading to an endless creation of new processes. freeze_support ensures that this doesn't happen and the program runs smoothly with the expected number of processes.

[s-simoncelli]

Hi, thanks again for your contribution that is very much appreciated :)
To my knowledge you need to freeze the application only if the editor or any other imported module relies on the Python ‘multiprocessing’ module which is not used by the editor. Threads of new windows and when running pywr are spawned using the Qt bindings.

Have you encountered any issue without freezing the application?

Cheers,
Stefano

[KmBase]

Have you encountered any issue without freezing the application?

it's works wel,but it might re-execute the code when freezing the application.
by the way,there is a crash ,when draing the buton in welcome page.