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#QComBoximport sysfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *class QComboxDemo(QWidget):    def __init__(self):        super(QComboxDemo,self).__init__()        self.initUI()    def initUI(self):        self.setWindowTitle('下拉列表控件')        self.resize(300,200)        layout= QVBoxLayout()        self.label =QLabel('请选择编辑语言')        self.cb = QComboBox()        self.cb.addItem('C++')        self.cb.addItem('Python')        self.cb.addItems(['Java',"C#",'Ruby'])        self.cb.currentIndexChanged.connect(self.selectChange)        layout.addWidget(self.label)        layout.addWidget(self.cb)        self.setLayout(layout)    def selectChange(self,i):        self.label.setText(self.cb.currentText())        self.label.adjustSize()        for count in range(self.cb.count()):            print('item'+str(count)+'='+self.cb.itemText(count))            print('current index', i, 'select changed'+ self.cb.currentText())if __name__ == '__main__':    app =QApplication(sys.argv)    main = QComboxDemo()    main.show()    app.exit(app.exec_())

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