为什么这段代码运行后显示：进程已结束,退出代码0，却没有我设计的窗口出现，求解决？？

Question

-*- coding: utf-8 -*-

Form implementation generated from reading ui file 'jinhang.ui'

#

Created by: PyQt5 UI code generator 5.13.0

#

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.label = QtWidgets.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(30, 40, 71, 31))
self.label.setObjectName("label")
self.label_2 = QtWidgets.QLabel(self.centralwidget)
self.label_2.setGeometry(QtCore.QRect(30, 100, 91, 21))
self.label_2.setObjectName("label_2")
self.label_3 = QtWidgets.QLabel(self.centralwidget)
self.label_3.setGeometry(QtCore.QRect(30, 140, 61, 21))
self.label_3.setObjectName("label_3")
self.label_4 = QtWidgets.QLabel(self.centralwidget)
self.label_4.setGeometry(QtCore.QRect(180, 140, 61, 16))
self.label_4.setObjectName("label_4")
self.label_5 = QtWidgets.QLabel(self.centralwidget)
self.label_5.setGeometry(QtCore.QRect(30, 180, 51, 21))
self.label_5.setObjectName("label_5")
self.label_6 = QtWidgets.QLabel(self.centralwidget)
self.label_6.setGeometry(QtCore.QRect(30, 210, 71, 31))
self.label_6.setObjectName("label_6")
self.label_7 = QtWidgets.QLabel(self.centralwidget)
self.label_7.setGeometry(QtCore.QRect(190, 210, 71, 31))
self.label_7.setObjectName("label_7")
self.label_8 = QtWidgets.QLabel(self.centralwidget)
self.label_8.setGeometry(QtCore.QRect(30, 250, 71, 21))
self.label_8.setObjectName("label_8")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(80, 490, 75, 23))
self.pushButton.setObjectName("pushButton")
self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
self.pushButton_2.setGeometry(QtCore.QRect(220, 490, 75, 23))
self.pushButton_2.setObjectName("pushButton_2")
self.textEdit = QtWidgets.QTextEdit(self.centralwidget)
self.textEdit.setGeometry(QtCore.QRect(100, 40, 71, 31))
self.textEdit.setObjectName("textEdit")
self.textEdit_2 = QtWidgets.QTextEdit(self.centralwidget)
self.textEdit_2.setGeometry(QtCore.QRect(180, 40, 71, 31))
self.textEdit_2.setObjectName("textEdit_2")
self.textEdit_3 = QtWidgets.QTextEdit(self.centralwidget)
self.textEdit_3.setGeometry(QtCore.QRect(260, 40, 71, 31))
self.textEdit_3.setObjectName("textEdit_3")
self.textEdit_4 = QtWidgets.QTextEdit(self.centralwidget)
self.textEdit_4.setGeometry(QtCore.QRect(90, 130, 71, 31))
self.textEdit_4.setObjectName("textEdit_4")
self.textEdit_5 = QtWidgets.QTextEdit(self.centralwidget)
self.textEdit_5.setGeometry(QtCore.QRect(240, 130, 71, 31))
self.textEdit_5.setObjectName("textEdit_5")
self.textEdit_6 = QtWidgets.QTextEdit(self.centralwidget)
self.textEdit_6.setGeometry(QtCore.QRect(100, 210, 71, 31))
self.textEdit_6.setObjectName("textEdit_6")
self.textEdit_7 = QtWidgets.QTextEdit(self.centralwidget)
self.textEdit_7.setGeometry(QtCore.QRect(260, 210, 71, 31))
self.textEdit_7.setObjectName("textEdit_7")
self.plainTextEdit = QtWidgets.QPlainTextEdit(self.centralwidget)
self.plainTextEdit.setGeometry(QtCore.QRect(380, 0, 351, 551))
self.plainTextEdit.setObjectName("plainTextEdit")
self.plainTextEdit_2 = QtWidgets.QPlainTextEdit(self.centralwidget)
self.plainTextEdit_2.setGeometry(QtCore.QRect(30, 270, 341, 211))
self.plainTextEdit_2.setObjectName("plainTextEdit_2")
self.verticalScrollBar = QtWidgets.QScrollBar(self.centralwidget)
self.verticalScrollBar.setGeometry(QtCore.QRect(710, 0, 16, 551))
self.verticalScrollBar.setOrientation(QtCore.Qt.Vertical)
self.verticalScrollBar.setObjectName("verticalScrollBar")
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))
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.label.setText(_translate("MainWindow", "aa号："))
    self.label_2.setText(_translate("MainWindow", "时间段："))
    self.label_3.setText(_translate("MainWindow", "开始时间："))
    self.label_4.setText(_translate("MainWindow", "结束时间："))
    self.label_5.setText(_translate("MainWindow", "bb段："))
    self.label_6.setText(_translate("MainWindow", "开始点："))
    self.label_7.setText(_translate("MainWindow", "结束点："))
    self.label_8.setText(_translate("MainWindow", "分析结果："))
    self.pushButton.setText(_translate("MainWindow", "清 除"))
    self.pushButton_2.setText(_translate("MainWindow", "开始分析"))

if __name__ == "MainWindow":

    import sys

    app = QtWidgets.QApplication(sys.argv)

    widget = QtWidgets.QWidget()

    ui = Ui_MainWindow() 

    ui.setupUi(MainWindow)

    MainWindow.show()

    sys.exit(app.exec_())

Answer 1

https://blog.csdn.net/yukinoai/article/details/100008432