Exception Error python "unhandled AttributeError" 'QLineEdit' object has no attribute 'get'

my code when run the function data are not retrive from QLineEdit.get()

Console Error

 Exception "unhandled AttributeError"
'QLineEdit' object has no attribute 'get'

my Function Code

def showDB(self):
        self.value=self.var.get()
        self.show.setText(self.value)

Fulll Class demo.py

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

# Form implementation generated from reading ui file 'C:\Users\ultronhouse11\Documents\Eric6\collageApp\ui\demo.ui'
#
# Created by: PyQt5 UI code generator 5.14.1
#
# WARNING! All changes made in this file will be lost!


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralWidget = QtWidgets.QWidget(MainWindow)
        self.centralWidget.setObjectName("centralWidget")
        self.btn = QtWidgets.QPushButton(self.centralWidget)
        self.btn.setGeometry(QtCore.QRect(290, 190, 75, 23))
        self.btn.setObjectName("btn")
        self.var = QtWidgets.QLineEdit(self.centralWidget)
        self.var.setGeometry(QtCore.QRect(270, 160, 113, 20))
        self.var.setObjectName("var")
        self.show = QtWidgets.QLabel(self.centralWidget)
        self.show.setGeometry(QtCore.QRect(230, 260, 241, 41))
        font = QtGui.QFont()
        font.setPointSize(22)
        font.setBold(True)
        font.setWeight(75)
        self.show.setFont(font)
        self.show.setObjectName("show")
        MainWindow.setCentralWidget(self.centralWidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
        self.btn.clicked.connect(self.showDB)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.btn.setText(_translate("MainWindow", "PushButton"))
        self.show.setText(_translate("MainWindow", "TextLabel"))

    def showDB(self):
        self.value=self.var.get()
        self.show.setText(self.value)


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())