from PyQt5.QtCore import Qt, QT_VERSION, qFatal
from PyQt5.QtGui import QPixmap
from PyQt5.QtWidgets import QMainWindow, QWidget, QApplication, QLabel, QPushButton, QHBoxLayout, QVBoxLayout

import traceback
def excepthook(type_, value, traceback_):
    traceback.print_exception(type_, value, traceback_)
    qFatal('')
sys.excepthook = excepthook

Source : handle_unhandled.py