继承的Model子类在QListView中不显示

class StringListModel(QAbstractListModel):
    def __init__(self, parent=None):
        super(StringListModel, self).__init__(parent)
    
    def data(self, index, role):
        if role == QtCore.Qt.ItemDataRole.DisplayRole:
            return 1    #Your code

需要data中是DisplayRole