如何在QGridLayout中设置小部件的顺序

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QGridLayout, QLabel, QLineEdit

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        gridLayout = QGridLayout()
        self.setLayout(gridLayout)

        label1 = QLabel('Label 1')
        label2 = QLabel('Label 2')
        label3 = QLabel('Label 3')
        lineEdit1 = QLineEdit()
        lineEdit2 = QLineEdit()
        lineEdit3 = QLineEdit()

        # 设置小部件的位置
        gridLayout.addWidget(label1, 0, 0)  # 第一行第一列
        gridLayout.addWidget(label2, 1, 0)  # 第二行第一列
        gridLayout.addWidget(label3, 2, 0)  # 第三行第一列
        gridLayout.addWidget(lineEdit1, 0, 1)  # 第一行第二列
        gridLayout.addWidget(lineEdit2, 1, 1)  # 第二行第二列
        gridLayout.addWidget(lineEdit3, 2, 1)  # 第三行第二列

        self.setWindowTitle('QGridLayout Example')
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    widget = MyWidget()
    sys.exit(app.exec_())