PYQT5 Exiting Problem

I'm trying to access the PYQT code that PyCharm created.  I've got the following code.

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(585, 321)
        self.label = QtWidgets.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(250, 50, 61, 21))
        self.label.setMinimumSize(QtCore.QSize(41, 0))
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setWordWrap(True)
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(Dialog)
        self.pushButton.setGeometry(QtCore.QRect(266, 98, 31, 23))
        self.pushButton.setObjectName("pushButton")
        font = QtGui.QFont()
        font.setPointSize(12)

        self.retranslateUi(Dialog)
        self.pushButton.clicked.connect(Dialog.SB_UP_click)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
        self.label.setText(_translate("Dialog", "SOUTH"))
        self.pushButton.setText(_translate("Dialog", "UP"))

from PyQt5 import QtCore, QtGui, QtWidgets
from My_Window import Ui_Dialog
import sys


class MainWindow(QtWidgets.QMainWindow, Ui_Dialog):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)

  
    def SB_UP_click(self):
        print("SB UP")
        self.label_2.setText("HI")
        print("got here")

  
def main():
    app = QtWidgets.QApplication([])
    window = MainWindow()
    window.show()

    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

The problem is that when I click the button it exits out on the self.label.settext line and never printe "got here".  "SB_Up" is printed though.  Any idea on what I've done wrong?