When I create a simple application with the below code, I get the additional errors/messages (all starting with QPainter) in the command line output in some scenarios (detailed in table below). It looks like a bug with PyQt6's latest version (6.9.0) but there is no way to debug since none of my code stop points can catch those items. I can't debug effectively since Pycharm doesn't show error messages in any of the runs. Any guidance on debugging further? P.S. After the program goes into app execution, I hit windows right on the window to clip the window to the right side of my window (to trigger resize event manually). Code import sys from PyQt6.QtWidgets import ( QApplication, QMainWindow, QWidget, QVBoxLayout, QLabel, ) from PyQt6.QtGui import QPainter, QColor from PyQt6.QtCore import Qt class MyWidget(QWidget): def __init__(self): print('--------MyWidget Init Start ') super().__init__() self.init_ui() print('--------MyWidget Init End ') def init_ui(self): print('--------MyWidget Init UI Start ') self.setGeometry(100, 100, 300, 200) layout = QVBoxLayout() self.setLayout(layout) label = QLabel("This is a simple Qt application ") layout.addWidget(label) print('--------MyWidget Init UI End ') def paintEvent(self, event): print('--------MyWidget Paint Start ') painter = QPainter(self) painter.setPen(Qt.GlobalColor.blue) painter.drawLine(0, 0, 200, 100) # Example line drawing print('--------MyWidget Paint End ') class MainWindow(QMainWindow): def __init__(self): print('----MainWindow Init Start ') super().__init__() self.init_ui() print('----MainWindow Init End ') def init_ui(self): print('----MainWindow Init UI Start ') self.setWindowTitle("Simple Qt Example ") self.setGeometry(100, 100, 600, 400) widget = MyWidget() self.setCentralWidget(widget) print('----MainWindow Init UI End ') if __name__ == "__main__": print('Initialize Application ') app = QApplication([]) print('Initialize MainWindow ') window = MainWindow() print('Show MainWindow ') window.show() print('Resizing Window ') window.resizeEvent(None) print('Going for App execution ') sys.exit(app.exec()) PyCharm/DOS Command prompt Version of PyQt6 Error messages appear DOS Prompt 6.9.0 Yes PyCharm 6.9.0 No DOS Prompt 6.8.1 No PyCharm 6.8.1 No DOS Prompt 6.8.0 No PyCharm 6.8.0 No "Error Messages Appear" = "No" scenario Output Initialize Application Initialize MainWindow ----MainWindow Init Start ----MainWindow Init UI Start --------MyWidget Init Start --------MyWidget Init UI Start --------MyWidget Init UI End --------MyWidget Init End ----MainWindow Init UI End ----MainWindow Init End Show MainWindow Resizing Window Going for App execution --------MyWidget Paint Start --------MyWidget Paint End "Error Messages Appear" = "Yes" scenario Output Initialize Application Initialize MainWindow ----MainWindow Init Start ----MainWindow Init UI Start --------MyWidget Init Start --------MyWidget Init UI Start --------MyWidget Init UI End --------MyWidget Init End ----MainWindow Init UI End ----MainWindow Init End Show MainWindow Resizing Window Going for App execution --------MyWidget Paint Start --------MyWidget Paint End QPainter::begin: Paint device returned engine == 0, type: 3 QPainter::setCompositionMode: Painter not active QPainter::fillRect: Painter not active QPainter::setCompositionMode: Painter not active QPainter::setBrush: Painter not active QPainter::setPen: Painter not active QPainter::drawRects: Painter not active QPainter::setPen: Painter not active QPainter::setFont: Painter not active QPainter::setFont: Painter not active QPainter::setBrush: Painter not active QPainter::setPen: Painter not active QPainter::setPen: Painter not active QPainter::setBrush: Painter not active QPainter::setPen: Painter not active QPainter::setPen: Painter not active QPainter::setBrush: Painter not active QPainter::setPen: Painter not active QPainter::setPen: Painter not active QPainter::end: Painter not active, aborted QPainter::begin: Paint device returned engine == 0, type: 3 QPainter::setCompositionMode: Painter not active QPainter::fillRect: Painter not active QPainter::setCompositionMode: Painter not active QPainter::setBrush: Painter not active QPainter::setPen: Painter not active QPainter::drawRects: Painter not active QPainter::setPen: Painter not active QPainter::setFont: Painter not active QPainter::setFont: Painter not active QPainter::setBrush: Painter not active QPainter::setPen: Painter not active QPainter::setPen: Painter not active QPainter::setBrush: Painter not active QPainter::setPen: Painter not active QPainter::setPen: Painter not active QPainter::setBrush: Painter not active QPainter::setPen: Painter not active QPainter::setPen: Painter not active QPainter::end: Painter not active, aborted --------MyWidget Paint Start --------MyWidget Paint End --------MyWidget Paint Start --------MyWidget Paint End --------MyWidget Paint Start --------MyWidget Paint End --------MyWidget Paint Start --------MyWidget Paint End --------MyWidget Paint Start --------MyWidget Paint End Continue reading...
