用 eric6 与 PyQt5 实现python的极速GUI编程（系列02）---- 省市县（区）下拉列表多级联动...

import area

# -*- coding: utf-8 -*-

"""
Module implementing Logic.
"""
import sys

from PyQt5.QtCore import pyqtSlot
from PyQt5.QtWidgets import QDialog, QApplication

from Ui_union import Ui_Dialog

import area

class Logic(QDialog, Ui_Dialog):
    """
    Class documentation goes here.
    """
    def __init__(self, parent=None):
        """
        Constructor
        
        @param parent reference to the parent widget (QWidget)
        """
        super(Logic, self).__init__(parent)
        self.setupUi(self)
        
        self.setWindowTitle('Pyqt ComboBox')
        
        self.dictProvince = area.dictProvince
        self.dictCity = area.dictCity
        self.dictTown = area.dicTown
        
        self.pushButton_ok.hide()
        
        self.comboBox_province.clear() # 清空items
        self.comboBox_province.addItem('请选择')
        #初始化省
        for k, v in self.dictProvince.items():
            self.comboBox_province.addItem(v, k) # 键、值反转
    
    @pyqtSlot(int)
    def on_comboBox_province_activated(self, index):
        # 取省份名称
        #value = self.comboBox_province.itemText(index)
        # 取省份的键值
        key = self.comboBox_province.itemData(index)
        
        self.comboBox_town.clear() # 清空items
        self.comboBox_city.clear() # 清空items
        if key:
            #self.lblResult.setText('未选择！')
            self.comboBox_city.addItem('请选择')
            #初始化市
            for k, v in self.dictCity[key].items():
                self.comboBox_city.addItem(v, k)  # 键、值反转
    
    @pyqtSlot(int)
    def on_comboBox_city_activated(self, index):
        # 取市的名称
        #value = self.comboBox_city.itemText(index)
        # 取市的键值
        key = self.comboBox_city.itemData(index)
        
        self.comboBox_town.clear() # 清空items
        if key:
            self.comboBox_town.addItem('请选择')
            #初始化县区
            for k, v in self.dictTown[key].items():
                self.comboBox_town.addItem(v, k)  # 键、值反转
    
    @pyqtSlot(int)
    def on_comboBox_town_activated(self, index):
        self.pushButton_ok.show()

    @pyqtSlot()
    def on_pushButton_ok_clicked(self):
        # 取当前索引
        province_index = self.comboBox_province.currentIndex()
        city_index = self.comboBox_city.currentIndex()
        town_index = self.comboBox_town.currentIndex()
        # 取当前省市县名称
        province_name = self.comboBox_province.itemText(province_index)
        city_name = self.comboBox_city.itemText(city_index)
        town_name = self.comboBox_town.itemText(town_index)
        # 显示结果
        self.lblResult.setText('{}-{}-{}'.format(province_name,city_name, town_name))
        

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