pyqt 实现左列表向右列表添加

import sys
from PyQt5.QtGui import QPixmap
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QListWidget, QListWidgetItem, QHBoxLayout


class Demo(QWidget):
    def __init__(self):
        super(Demo, self).__init__()
        self.pic_label = QLabel(self)  # 1
        self.pic_label.setPixmap(QPixmap(‘arrow.png‘))

        self.listwidget_1 = QListWidget(self)  # 2
        self.listwidget_2 = QListWidget(self)
        self.listwidget_1.doubleClicked.connect(lambda: self.change_func(self.listwidget_1))
        self.listwidget_2.doubleClicked.connect(lambda: self.change_func(self.listwidget_2))

        for i in range(6):  # 3
            text = ‘Item {}‘.format(i)
            self.item = QListWidgetItem(text)
            self.listwidget_1.addItem(self.item)

        self.item_6 = QListWidgetItem(‘Item 6‘, self.listwidget_1)  # 4

        self.listwidget_1.addItem(‘Item 7‘)  # 5
        str_list = [‘Item 9‘, ‘Item 10‘]
        self.listwidget_1.addItems(str_list)

        self.item_8 = QListWidgetItem(‘Item 8‘)  # 6
        self.listwidget_1.insertItem(8, self.item_8)
        # self.listwidget_1.insertItem(8, ‘Item 8‘)

        self.h_layout = QHBoxLayout()
        self.h_layout.addWidget(self.listwidget_1)
        self.h_layout.addWidget(self.pic_label)
        self.h_layout.addWidget(self.listwidget_2)
        self.setLayout(self.h_layout)

    def change_func(self, listwidget):  # 7
        if listwidget == self.listwidget_1:
            item = QListWidgetItem(self.listwidget_1.currentItem())
            self.listwidget_2.addItem(item)
            print(self.listwidget_2.count())
        else:
            self.listwidget_2.takeItem(self.listwidget_2.currentRow())
            print(self.listwidget_2.count())


if __name__ == ‘__main__‘:
    app = QApplication(sys.argv)
    demo = Demo()
    demo.show()
    sys.exit(app.exec_())