Qt designer ile yapılan uygulama açılmıyor

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

# Form implementation generated from reading ui file 'giris_forum.ui'
#
# Created by: PyQt5 UI code generator 5.15.7
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets



class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(456, 379)
        MainWindow.setMinimumSize(QtCore.QSize(456, 379))
        MainWindow.setMaximumSize(QtCore.QSize(456, 379))
        MainWindow.setAutoFillBackground(False)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(120, 70, 71, 16))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(150, 110, 31, 16))
        self.label_2.setObjectName("label_2")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(190, 70, 113, 16))
        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(190, 110, 113, 16))
        self.lineEdit_2.setEchoMode(QtWidgets.QLineEdit.Password)
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(230, 150, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(40, 190, 281, 20))
        font = QtGui.QFont()
        font.setBold(False)
        font.setItalic(False)
        font.setUnderline(True)
        font.setWeight(50)
        font.setStrikeOut(False)
        self.label_3.setFont(font)
        self.label_3.setObjectName("label_3")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 456, 21))
        self.menubar.setObjectName("menubar")
        self.menuBilgi = QtWidgets.QMenu(self.menubar)
        self.menuBilgi.setObjectName("menuBilgi")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.actionDeveloper = QtWidgets.QAction(MainWindow)
        self.actionDeveloper.setObjectName("actionDeveloper")
        self.menuBilgi.addSeparator()
        self.menuBilgi.addAction(self.actionDeveloper)
        self.menubar.addAction(self.menuBilgi.menuAction())

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

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Giriş Formu"))
        self.label.setText(_translate("MainWindow", "Kullanıcı adı:"))
        self.label_2.setText(_translate("MainWindow", "Şifre:"))
        self.pushButton.setText(_translate("MainWindow", "Giriş Yap"))
        self.label_3.setText(_translate("MainWindow", "Lütfen kullanıcı adı ve şifrenizi kimseyler paylaşmayınız!"))
        self.menuBilgi.setTitle(_translate("MainWindow", "Daha fazla"))
        self.actionDeveloper.setText(_translate("MainWindow", "Developer"))


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_())