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   from PyQt5.QtWidgets import QComboBox, QLineEdit, QListWidget, QCheckBox, QListWidgetItem
class ComboCheckBox(QComboBox):
    def loadItems(self, items):
        self.items = items
        self.items.insert(0, '全部')
        self.row_num = len(self.items)
        self.Selectedrow_num = 0
        self.qCheckBox = []
        self.qLineEdit = QLineEdit()
        self.qLineEdit.setReadOnly(True)
        self.qListWidget = QListWidget()
        self.addQCheckBox(0)
        self.qCheckBox[0].stateChanged.connect(self.All)
        for i in range(0, self.row_num):
            self.addQCheckBox(i)
            self.qCheckBox[i].stateChanged.connect(self.showMessage)
        self.setModel(self.qListWidget.model())
        self.setView(self.qListWidget)
        self.setLineEdit(self.qLineEdit)
        # self.qLineEdit.textChanged.connect(self.printResults)
    def showPopup(self):
        # 重写showPopup方法，避免下拉框数据多而导致显示不全的问题
        select_list = self.Selectlist()  # 当前选择数据
        self.loadItems(items=self.items[1:])  # 重新添加组件
        for select in select_list:
            index = self.items[:].index(select)
            self.qCheckBox[index].setChecked(True)   # 选中组件
        return QComboBox.showPopup(self)
    def printResults(self):
        list = self.Selectlist()
        print(list)
    def addQCheckBox(self, i):
        self.qCheckBox.append(QCheckBox())
        qItem = QListWidgetItem(self.qListWidget)
        self.qCheckBox[i].setText(self.items[i])
        self.qListWidget.setItemWidget(qItem, self.qCheckBox[i])
    def Selectlist(self):
        Outputlist = []
        for i in range(1, self.row_num):
            if self.qCheckBox[i].isChecked() == True:
                Outputlist.append(self.qCheckBox[i].text())
        self.Selectedrow_num = len(Outputlist)
        return Outputlist
    def showMessage(self):
        Outputlist = self.Selectlist()
        self.qLineEdit.setReadOnly(False)
        self.qLineEdit.clear()
        show = ';'.join(Outputlist)
        if self.Selectedrow_num == 0:
            self.qCheckBox[0].setCheckState(0)
        elif self.Selectedrow_num == self.row_num - 1:
            self.qCheckBox[0].setCheckState(2)
        else:
            self.qCheckBox[0].setCheckState(1)
        self.qLineEdit.setText(show)
        self.qLineEdit.setReadOnly(True)
    def All(self, zhuangtai):
        if zhuangtai == 2:
            for i in range(1, self.row_num):
                self.qCheckBox[i].setChecked(True)
        elif zhuangtai == 1:
            if self.Selectedrow_num == 0:
                self.qCheckBox[0].setCheckState(2)
        elif zhuangtai == 0:
            self.clear()
    def clear(self):
        for i in range(self.row_num):
            self.qCheckBox[i].setChecked(False)
    def currentText(self):
        text = QComboBox.currentText(self).split(';')
        if text.__len__() == 1:
            if not text[0]:
                return []
            else:
                return "('{}')".format("','".join(text))
        else:
            return "('{}')".format("','".join(text))
if __name__ == '__main__':
    from PyQt5 import QtWidgets,QtCore
    import sys
    items = ['Python', 'R', 'Java', 'C++', 'CSS']
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    comboBox1 = ComboCheckBox(Form)
    comboBox1.setGeometry(QtCore.QRect(10, 10, 100, 20))
    comboBox1.setMinimumSize(QtCore.QSize(100, 20))
    comboBox1.loadItems(items)
    Form.show()
    sys.exit(app.exec_())