Python 如何在QTableWidget中将列中的所有项对齐到中心

我正在使用PyQt5和PyCharm。如何将一列下的所有单元格对齐到中心？下面的代码似乎正在工作，但只针对一个单元格，即标题。我应该更改或添加什么

item3 = QtWidgets.QTableWidgetItem('Item Name')
item3.setTextAlignment(QtCore.Qt.AlignHCenter|QtCore.Qt.AlignVCenter)
self.tableWidget.setHorizontalHeaderItem(2, item3)

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建立柱对齐的简单方法是通过代理：

import sys
from PyQt5 import QtCore, QtWidgets


class AlignDelegate(QtWidgets.QStyledItemDelegate):
    def initStyleOption(self, option, index):
        super(AlignDelegate, self).initStyleOption(option, index)
        option.displayAlignment = QtCore.Qt.AlignCenter


class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.tableWidget = QtWidgets.QTableWidget(15, 6)
        self.setCentralWidget(self.tableWidget)

        for i in range(self.tableWidget.rowCount()):
            for j in range(self.tableWidget.columnCount()):
                it = QtWidgets.QTableWidgetItem("{}-{}".format(i, j))
                self.tableWidget.setItem(i, j, it)

        delegate = AlignDelegate(self.tableWidget)
        self.tableWidget.setItemDelegateForColumn(2, delegate)

        # for all columns:
        # self.tableWidget.setItemDelegate(delegate)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.resize(640, 480)
    w.show()
    sys.exit(app.exec_())