如何在ListModel中获取特定项目的索引？

from PyQt5.QtCore import QAbstractListModel, QModelIndex, Qt

class MyListModel(QAbstractListModel):
    def __init__(self, data):
        super().__init__()
        self.data = data

    def rowCount(self, parent=QModelIndex()):
        return len(self.data)

    def data(self, index, role=Qt.DisplayRole):
        if role == Qt.DisplayRole:
            return self.data[index.row()]

    def getIndex(self, item):
        return self.data.index(item)

# 创建一个ListModel对象
myListModel = MyListModel(["item1", "item2", "item3", "item4"])

# 获取特定项目的索引
index = myListModel.getIndex("item3")
print(index)  # 输出：2