def openColorDialog(self, label):
dialog = QColorDialog()
dialog.setOption(QColorDialog.ShowAlphaChannel, on=True)
print(dialog.testOption(dialog.ShowAlphaChannel)) #returning True
color = QColorDialog.getColor(options=QColorDialog.ShowAlphaChannel)
if color.isValid():
label.setStyleSheet("background-color:" + color.name(QColor.HexArgb) + ";")
