在使用ｐｙｑｔ５进行界面开发的时候，常用的是下拉框（QComboBox）、复选框（QCheckBox），但是在某些时候，需要在下拉菜单选择时进行多选。

    1. from PyQt5 import QtGui, QtCore, QtWidgets
    2. import sys, os
    4. # subclass
    5. class CheckableComboBox(QtWidgets.QComboBox):
    6.     # once there is a checkState set, it is rendered
    7.     # here we assume default Unchecked
    8.     def addItem(self, item):
    9.         super(CheckableComboBox, self).addItem(item)
    10.         item = self.model().item(self.count()-1,0)
    11.         item.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled)
    12.         item.setCheckState(QtCore.Qt.Unchecked)
    14.     def itemChecked(self, index):
    15.         item = self.model().item(index,0)
    16.         return item.checkState() == QtCore.Qt.Checked
    18. # the basic main()
    19. app = QtWidgets.QApplication(sys.argv)
    20. dialog = QtWidgets.QMainWindow()
    22. mainWidget = QtWidgets.QWidget()
    23. dialog.setCentralWidget(mainWidget)
    24. ComboBox = CheckableComboBox(mainWidget)
    26. for j in range(6):
    27.     ComboBox.addItem("Check Item " + str(j))    
    29. '''
    30. cnt = ComboBox.count()
    31. for i in range(cnt):
    32.     ret = ComboBox.itemChecked(i)
    33.     if ret:
    34.         print(ComboBox.itemText(i))'''
    36. dialog.show()
    37. sys.exit(app.exec_())

    引用：
    １.　Флажки в Combobox с использованием PyQt