PyQt5 blur widget

blur_widget.py

class BlurWidget(QWidget):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        effect = QGraphicsBlurEffect(self)
        effect.setBlurRadius(120)
        self.setGraphicsEffect(effect)

        self.parent().installEventFilter(self)

    def eventFilter(self, obj, e):
        if obj == self.parent() and e.type() == QEvent.Resize:
            self.resize(e.size().width()-e.size().height(), e.size().height())
        return super().eventFilter(obj, e)