How to add text from QLineEdit to QListWidget on button click?

Question

Python

#!/usr/bin/python3
# -*- coding: utf-8 -*-

import sys
from PyQt5.QtWidgets import (QWidget, QPushButton,
QHBoxLayout, QVBoxLayout, QApplication, QListWidget, QLineEdit, QListWidgetItem,
QFileDialog)

class Example(QWidget):

def __init__(self):
super().__init__()

self.initUI()

def initUI(self):

Bt_1 = QPushButton("New", self)
Bt_1.move(10,10)

Bt_2 = QPushButton("Mod", self)
Bt_2.move(10,35)

List = QListWidget(self)
List.move(90,10)

Line = QLineEdit(self)
Line. move(10, 60)
Line.resize(70, 20)

Line_2 = QLineEdit(self)
Line_2.move(10, 85)
Line_2.resize(70, 20)

self.setGeometry(300, 300, 400, 400)
self.show()

def on_addClicked():
text = self.Line + " " + Line_2.text()
if len(text):
lvi = QListWidgetItem(self.List)[0]
lvi.setText(0, text)

def delete():


Bt_1.clicked.connect(on_addClicked)
Bt_2.clicked.connect(delete)

if __name__ == '__main__':

app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())

Answer 1

you haven't saved any widget references. It is better to store the created elements somewhere in order to have access to them.
And adding via the addItem method
QListWidget.addItem

self.button1 = QPushButton('text') #  класс родителя можно не передавать, Qt сделает все сам
self.ql = QListWidget()
self.ql.addItem(QListItem('text'))