Python pyqt5下拉多选框的实现示例

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class ComboxDemo(QWidget):
    def __init__(self, parent=None):
        super(ComboxDemo, self).__init__(parent)
        self.setWindowTitle("combox 例子")
        self.resize(300, 90)
        layout = QVBoxLayout()
        self.lbl = QLabel("")

        self.cb = QComboBox()
        self.cb.addItem("C")
        self.cb.addItem("C++")
        self.cb.addItems(["Java", "C#", "Python"])
        self.cb.currentIndexChanged.connect(self.selectionchange)
        layout.addWidget(self.cb)
        layout.addWidget(self.lbl)
        self.setLayout(layout)

    def selectionchange(self, i):
        self.lbl.setText(self.cb.currentText())
        self.lbl.adjustSize()

        print("Items in the list are :")
        for count in range(self.cb.count()):
            print('item' + str(count) + '=' + self.cb.itemText(count))#每个选项名称
            print("Current index", i, "selection changed ", self.cb.currentText())#当前选项

if __name__ == '__main__':
    app = QApplication(sys.argv)
    comboxDemo = ComboxDemo()
    comboxDemo.show()
    sys.exit(app.exec_())

from PyQt5.QtWidgets import QComboBox, QListWidgetItem, QListWidget, QCheckBox, \
  QApplication, QVBoxLayout, QWidget,QPushButton,QHBoxLayout,QLineEdit
import sys

class ComboCheckBox(QWidget):
  def __init__(self, parent=None):
        super(ComboCheckBox, self).__init__(parent)

        self.items = ['语文', '数学', '英语', '体育']
        self.box_list = []
        self.comb = QComboBox(self) #列表框QComboBox
        self.listwidget = QListWidget(self) #（列表控件）

        for i in range(len(self.items)):
            self.box_list.append(QCheckBox(self))
            self.box_list[i].setText(self.items[i])
            item = QListWidgetItem(self.listwidget)
            self.listwidget.setItemWidget(item, self.box_list[i])
            # QComboBox添加模型和视图,QListWidget设置为QComboBox的View，QListWidget的Model设置为QComboBox的Model
        self.comb.setModel(self.listwidget.model())
        self.comb.setView(self.listwidget)

        self.btn = QPushButton('选择', self)
        self.btn.clicked.connect(self.get_selected)
        self.line=QLineEdit()
        #布局
        layout = QVBoxLayout()
        layout.addWidget(self.btn)
        layout.addWidget(self.comb)
        layout.addWidget(self.line)
        self.setLayout(layout)

  def get_selected(self):
      ret = []
      for i in range(len(self.items)):
          if self.box_list[i].isChecked():
              ret.append(self.box_list[i].text())
      self.line.setText(str(ret))



if __name__ == "__main__":
  app = QApplication(sys.argv)
  ui = ComboCheckBox()
  ui.show()
  sys.exit(app.exec_())