为什么我的代码仅显示白屏？

Question

我使用qt-desiger并将代码翻译为python

C:\Users\user\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\Scripts\pyside2-uic.exe -g python -o C:\test1.py C:\test.ui

我试图运行它，这就是我得到的

from PySide2.QtCore import (QCoreApplication, QMetaObject, QObject, QPoint,
    QRect, QSize, QUrl, Qt)
from PySide2.QtGui import (QBrush, QColor, QConicalGradient, QFont,
    QFontDatabase, QIcon, QLinearGradient, QPalette, QPainter, QPixmap,
    QRadialGradient)
from PySide2.QtWidgets import *

from PySide2.QtWidgets import QApplication,QWidget
import sys

class Ui_MainWindow(QWidget):
    def setupUi(self, MainWindow):
        if MainWindow.objectName():
            MainWindow.setObjectName(u"MainWindow")
        MainWindow.resize(764, 604)
        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName(u"centralwidget")
        self.centralwidget.setEnabled(True)
        self.centralwidget.setTabletTracking(False)
        self.gridLayout = QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName(u"gridLayout")
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalSpacer = QSpacerItem(20, 142, QSizePolicy.Minimum, QSizePolicy.Expanding)

        self.gridLayout.addItem(self.verticalSpacer, 0, 1, 1, 1)

        self.horizontalSpacer = QSpacerItem(254, 20, QSizePolicy.Expanding, QSizePolicy.Minimum)

        self.gridLayout.addItem(self.horizontalSpacer, 1, 0, 1, 1)

        self.widget = QWidget(self.centralwidget)
        self.widget.setObjectName(u"widget")
        self.widget.setStyleSheet(u"background-color: rgb(239, 41, 41);")
        self.verticalLayout = QVBoxLayout(self.widget)
        self.verticalLayout.setObjectName(u"verticalLayout")
        self.label = QLabel(self.widget)
        self.label.setObjectName(u"label")
        font = QFont()
        font.setPointSize(21)
        self.label.setFont(font)
        self.label.setAlignment(Qt.AlignCenter)

        self.verticalLayout.addWidget(self.label)

        self.textEdit = QTextEdit(self.widget)
        self.textEdit.setObjectName(u"textEdit")
        self.textEdit.setStyleSheet(u"background-color: rgb(255, 255, 255);")

        self.verticalLayout.addWidget(self.textEdit)


        self.gridLayout.addWidget(self.widget, 1, 1, 1, 1)

        self.verticalSpacer_2 = QSpacerItem(20, 141, QSizePolicy.Minimum, QSizePolicy.Expanding)

        self.gridLayout.addItem(self.verticalSpacer_2, 2, 1, 1, 1)

        self.horizontalSpacer_2 = QSpacerItem(254, 20, QSizePolicy.Expanding, QSizePolicy.Minimum)

        self.gridLayout.addItem(self.horizontalSpacer_2, 1, 2, 1, 1)

        self.gridLayout.setRowStretch(0, 1)
        self.gridLayout.setRowStretch(2, 1)
        self.gridLayout.setColumnStretch(0, 1)
        self.gridLayout.setColumnStretch(2, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QMenuBar(MainWindow)
        self.menubar.setObjectName(u"menubar")
        self.menubar.setGeometry(QRect(0, 0, 764, 22))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QStatusBar(MainWindow)
        self.statusbar.setObjectName(u"statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)

        QMetaObject.connectSlotsByName(MainWindow)
    # setupUi

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"MainWindow", None))
        self.label.setText(QCoreApplication.translate("MainWindow", u"Text", None))
    # retranslateUi

my = QApplication(sys.argv)
window = Ui_MainWindow()
window.show()

my.exec_()
sys.exit(0)

这段代码只给我一个白屏，应该给我。