PyQt5--QComboBox

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

 '''

 Created on Sep 20, 2018

 @author: SaShuangYiBing

 Comment:

 '''

 import sys

 from PyQt5.QtWidgets import QApplication,QWidget,QComboBox,QLabel

 class New_test(QWidget):

     def __init__(self):

         super().__init__()

         self.initUI()

     def initUI(self):

         self.lbl = QLabel('fruit',self)

         combo = QComboBox(self)

         combo.addItem('apple')

         combo.addItem('pair')

         combo.addItem('banana')

         combo.move(50,50)

         self.lbl.move(50,150)

         combo.activated[str].connect(self.onActive)

         self.setGeometry(300,300,300,200)

         self.setWindowTitle('QCombobox')

         self.show()

     def onActive(self,text):

         try:

             self.lbl.setText(text)

             self.lbl.adjustSize()

         except Exception as e:

             print (e)

 if __name__ == '__main__':

     app = QApplication(sys.argv)

     ex = New_test()

     sys.exit(app.exec_())