请问python中用pyqt5的QtableView表格填充数据后行号不显示了，问题在哪？

Question

请问python中用pyqt5的QtableView表格填充数据后行号不显示了，问题在哪？
在填充数据前是有行号显示的

填充数据后左边的行号不见了

填充代码是这样的

        self.dfA=df
        self.myModelA =pandasModelA(self.dfA)
        self.tableViewA.setModel(self.myModelA)
        self.tableViewA.verticalHeader().setVisible(True)#行号 无效

发现可能是QTabWidget导致的
import sys
from PyQt5 import QtCore
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

import pandas as pd

class Win(QWidget):

def __init__(self):
    super().__init__()
    self.setGeometry(300, 300,500, 400)
    self.setWindowTitle('QTableView的使用')

    self.tableView = QTableView()

    self.tabWidget = QTabWidget()
    BuyWidget = QWidget()
    dlgLayout = QGridLayout()
    dlgLayout.addWidget(self.tableView)
    dlgLayout.addWidget(self.tableView, 1, 0,1,13)
    BuyWidget.setLayout(dlgLayout)
    #self.setLayout(dlgLayout)
    
    self.tabWidget.addTab(BuyWidget, 'A')
    self.model = QStandardItemModel(15,15)
    cols=['标题'+str(row) for row in range(15)]
    self.model.setHorizontalHeaderLabels(cols)

    for row in range(9):
        for column in range(15):
            item = QStandardItem('row%s,column%s'%(row,column))
            self.model.setItem(row,column,item)
    data=[[j for j in range(15)] for i in range(9)]
    df=pd.DataFrame(data,columns=[i for i in range(15)])

    #self.tableView.setModel(self.model)
    #self.tableView.setModel(self.model)
    self.tableView.setModel(pandasModelA(df))
    layout = QGridLayout()
    layout.addWidget(self.tabWidget,1,0)
    self.setLayout(layout)

class pandasModelA(QtCore.QAbstractTableModel):

def __init__(self, data):
    QtCore.QAbstractTableModel.__init__(self)
    self._data = data

def rowCount(self, parent=None):
    return self._data.shape[0]

def columnCount(self, parnet=None):
    return self._data.shape[1]

#self.sm.item(0, 0).setForeground(QtGui.QBrush(QtGui.QColor(255, 0, 0)))     
#self.sm.item(0, 0).setFont(QtGui.QFont('Times', 10, QtGui.QFont.Black))

def data(self, index, role=Qt.DisplayRole):
    if index.isValid():
        if role == Qt.DisplayRole:
            val=self._data.iloc[index.row(), index.column()]
            #return '%.2f' %(self._data.iloc[index.row(), index.column()])
            #return [str(val),'%.2f' %val][isinstance(val,float)]
            if isinstance(val,float):
                return '%.2f' %val
            else:
                return str(val)
    return None

def headerData(self, col, orientation, role):
    if orientation == Qt.Horizontal and role == Qt.DisplayRole:
        return self._data.columns[col]
    return None

if name == "__main__":

app = QApplication(sys.argv)
form = Win()
form.show()
sys.exit(app.exec_())

请高手指教