Соединение интерфейса и кода

Сделал код на питоне для конвертирования одной величины энергии в другую, создал интерфейс но не знаю как соединить. Помогите кто сможет.

Код:

#Вид входной энергии
InE = 0
#Количество входной энергии
InEM = 0
#Вид выходной энергии
OutE = 0
#Количество выходной энергии
OutEM = 0
#Переменная приравненная к 1 EU(переходная переменная)
MP = 0
InE = input("Входная энергия(RF/EU/AE):")
InEM = input("Количество энергии:")
OutE = input("Выходная энергия(RF/EU/AE):")
float(MP)
str(InE)


if str(InE).lower() == "RF".lower():
     MP = (float(InEM) / 4.5)
elif str(InE).lower() == "EU".lower():
    MP = InEM
elif str(InE).lower() == "AE".lower():
    MP = (float(InEM) / 2)


if str(OutE).lower() == "RF".lower():
    OutEM = (float(MP) * 4.5)
    print(OutEM)
elif str(OutE).lower() == "EU".lower():
    OutEM = MP
    print(OutEM)
elif str(OutE).lower() == "AE".lower():
    OutEM = float(MP) * 2
    print(OutEM)
else: print("Неправильно введён вид энергии")
input()

Интерфейс:

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

# Form implementation generated from reading ui file 'C:\Users\Kiprus\Desktop\untitled.ui'
#
# Created by: PyQt5 UI code generator 5.13.2
#
# 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(225, 216)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.InE = QtWidgets.QComboBox(self.centralwidget)
        self.InE.setGeometry(QtCore.QRect(20, 60, 81, 41))
        font = QtGui.QFont()
        font.setFamily("Palatino Linotype")
        font.setPointSize(20)
        font.setBold(True)
        font.setItalic(True)
        font.setWeight(75)
        self.InE.setFont(font)
        self.InE.setObjectName("InE")
        self.InE.addItem("")
        self.InE.addItem("")
        self.InE.addItem("")
        self.comboBox = QtWidgets.QComboBox(self.centralwidget)
        self.comboBox.setGeometry(QtCore.QRect(120, 60, 81, 41))
        font = QtGui.QFont()
        font.setFamily("Palatino Linotype")
        font.setPointSize(20)
        font.setBold(True)
        font.setItalic(True)
        font.setWeight(75)
        self.comboBox.setFont(font)
        self.comboBox.setObjectName("comboBox")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.comboBox.addItem("")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(20, 20, 81, 41))
        font = QtGui.QFont()
        font.setFamily("Palatino Linotype")
        font.setPointSize(12)
        font.setBold(True)
        font.setItalic(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(120, 20, 81, 41))
        font = QtGui.QFont()
        font.setFamily("Palatino Linotype")
        font.setPointSize(12)
        font.setBold(True)
        font.setItalic(True)
        font.setWeight(75)
        self.label_2.setFont(font)
        self.label_2.setObjectName("label_2")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(20, 120, 81, 31))
        font = QtGui.QFont()
        font.setFamily("Times New Roman")
        font.setPointSize(12)
        self.lineEdit.setFont(font)
        self.lineEdit.setTabletTracking(False)
        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(120, 120, 81, 31))
        font = QtGui.QFont()
        font.setFamily("Times New Roman")
        font.setPointSize(12)
        self.lineEdit_2.setFont(font)
        self.lineEdit_2.setObjectName("lineEdit_2")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 225, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.InE.setItemText(0, _translate("MainWindow", "RF"))
        self.InE.setItemText(1, _translate("MainWindow", "EU"))
        self.InE.setItemText(2, _translate("MainWindow", "AE"))
        self.comboBox.setItemText(0, _translate("MainWindow", "RF"))
        self.comboBox.setItemText(1, _translate("MainWindow", "EU"))
        self.comboBox.setItemText(2, _translate("MainWindow", "AE"))
        self.label.setText(_translate("MainWindow", "Входная"))
        self.label_2.setText(_translate("MainWindow", "Выходная"))


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_())

Заранее спасибо.