[Python] How to return a QColor as the QBackgroundRole in QTableView which has preset...

I encountered a strange problem as stated in the title.

I have a QTableView.

self.table = QTableView()


Then set some QSS to it.

self.table.setStyleSheet('''
QTableView {
border: 2px solid red;
padding: 5px;
border-radius: 5px;
gridline-color: red;
color: red;
}
QTableView::item{
border-color: none;
padding-left: 5px;
padding-right: 5px;
gridline-color: rgb(44, 49, 60);
border-bottom: 1px solid green;
}
QTableView::item:selected{
background-color: blue;
}
''')


Then I try to return a QColor inside the model (QAbstractTableModel), It just won't work. If I removed the style sheet, then it worked. Does anyone which line of my QSS created the problem?

if role == Qt.BackgroundRole and index.row() == self.headStart:
# Set header start color
return QColor(208, 74, 2)


I need the stylesheet, at the same time I also need Qt.BackgroundRole to work.

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