def init_lineedit(self):

        # 增加自动补全

        self.completer = QCompleter(items_list)

        self.lineedit.setCompleter(self.completer)

    def init_combobox(self):

        # 增加选项元素

        for i in range(len(items_list)):

            self.combobox.addItem(items_list[i])

        self.combobox.setCurrentIndex(-1)

        # 增加自动补全

        self.completer = QCompleter(items_list)

        self.combobox.setCompleter(self.completer)

import sys

from PyQt5.QtWidgets import *

from PyQt5.QtGui import *

from PyQt5.QtCore import *

################################################

items_list=["C","C++","Java","Python","JavaScript","C#","Swift","go","Ruby","Lua","PHP"]

################################################

class Widget(QWidget):

    def __init__(self, *args, **kwargs):

        super(Widget, self).__init__(*args, **kwargs)

        layout = QHBoxLayout(self)

        self.lineedit = QLineEdit(self, minimumWidth=200)

        self.combobox = QComboBox(self, minimumWidth=200)

        self.combobox.setEditable(True)

        layout.addWidget(QLabel("QLineEdit", self))

        layout.addWidget(self.lineedit)

        layout.addItem(QSpacerItem(20, 20, QSizePolicy.Expanding, QSizePolicy.Minimum))

        layout.addWidget(QLabel("QComboBox", self))

        layout.addWidget(self.combobox)

        #初始化combobox

        self.init_lineedit()

        self.init_combobox()

        #增加选中事件

        self.combobox.activated.connect(self.on_combobox_Activate)

    def init_lineedit(self):

        # 增加自动补全

        self.completer = QCompleter(items_list)

        self.lineedit.setCompleter(self.completer)

    def init_combobox(self):

        # 增加选项元素

        for i in range(len(items_list)):

            self.combobox.addItem(items_list[i])

        self.combobox.setCurrentIndex(-1)

        # 增加自动补全

        self.completer = QCompleter(items_list)

        self.combobox.setCompleter(self.completer)

    def on_combobox_Activate(self, index):

        print(self.combobox.count())

        print(self.combobox.currentIndex())

        print(self.combobox.currentText())

        print(self.combobox.currentData())

        print(self.combobox.itemData(self.combobox.currentIndex()))

        print(self.combobox.itemText(self.combobox.currentIndex()))

        print(self.combobox.itemText(index))

if __name__ == "__main__":

    app = QApplication(sys.argv)

    w = Widget()

    w.show()

    sys.exit(app.exec_())