pyqt5-下拉框聯動效果

from PyQt5.Qt import *

class MyWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("")
        self.resize(500,500)

        #后期這個字典可以從數據庫中傳入
        self.province = {
            "安徽省":["3401",{
                "合肥市":"340101",
                "六安市":"340102",
                "阜陽市":"340103",
                "蕪湖市":"340104",
                "滁州市":"340105",
                "宣城市":"340106",
                "黃山市":"340107",
                "亳州市":"340108",
            }],
            "江蘇省": ["5201", {
                "南京市": "520101",
                "蘇州市": "520102",
                "無錫市": "520103",
                "常州市": "520104",
                "鹽城市": "520105",
                "揚州市": "520106",
            }],
            "湖北省": ["4201", {
                "武漢市": "420101",
                "鄂州市": "420102",
                "荊門市": "420103",
                "襄陽市": "420104",
                "咸寧市": "420105",
                "黃岡市": "420106",
            }],
        }

        self.setup_ui()
        
    def setup_ui(self):
        #1.創建省下拉框，修改一些顯示尺寸（這個可以自行調節）
        qcb_pro = QComboBox(self)
        qcb_pro.resize(80,25)
        qcb_pro.move(100,100)
        self.qcb_pro = qcb_pro

        #3.創建市下拉選擇框
        qcb_city = QComboBox(self)
        qcb_city.resize(80,25)
        qcb_city.move(190,100)
        self.qcb_city = qcb_city

        # 4.為下拉框綁定觸發事件,currentIndexChanged信號有兩個方法，指定獲取int的這個方法
        qcb_pro.currentIndexChanged[int].connect(self.pro_changed)
        qcb_city.currentIndexChanged[int].connect(self.city_change)

        # 2.為省下拉框填充數據，可根據從數據庫中檢索出的數據，動態填充
        for key, val in self.province.items():
            qcb_pro.addItem(key, val[0])

    def pro_changed(self,pro_idx):
        #省下拉框改變，先清空市下拉框，然后添加市數據
        self.qcb_city.clear()
        for key,val in self.province[self.qcb_pro.currentText()][1].items():
            self.qcb_city.addItem(key,val)
        #同時獲取省下拉框對應的data數據，這里只是簡單打印
        print(self.qcb_pro.itemData(pro_idx))

    def city_change(self,city_idx):
        #因為在省下拉框操作的時候，有一個clear方法執行，也會觸發這個方法，但是由於被清空，傳遞過來的索引就是-1，就拿不到數據
        if city_idx == -1:
            pass
        else:
            # 同時獲取市下拉框對應的data數據，這里只是簡單打印
            print(self.qcb_city.itemData(city_idx))
        
        
if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    window = MyWindow()
    window.show()
    sys.exit(app.exec())