Why do popups called on a thread freeze?

Question

PyQt

I mean the usual pop-up messages, by type
QtWidgets.QMessageBox.information
If you call from the main thread - everything is fine,
but if from the threading.Thread thread - then everything hangs

If you use QThred, then it won't hang? Or is that not the problem?

Answer 1

if to use QThred, then will not hang up? Or is that not the problem?

You can't call widget methods from another thread, that's the way to go.
You emit a signal, catch it in the main graphics stream, react by showing a window.

but if from the threading.Thread - then everything hangs

Qt has QThread and QThreadPool + QRunnable