将.ui转换为.py后，按钮不起作用

Question

在我使用QT Creator创建UI并将其成功转换为python之后，我的所有按钮似乎都不起作用。我不知道为什么。

我制作了一个简单的Qstack布局，共有2页，每个页面都有一个按钮可以转到另一页。这在QtCreator中有效，但是当我在终端中运行python脚本时，只有一个打开的页面带有一个不起作用的按钮。

这是python代码：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
def setupUi(self, MainWindow):
    MainWindow.setObjectName("MainWindow")
    MainWindow.resize(400, 300)
    self.centralWidget = QtWidgets.QWidget(MainWindow)
    self.centralWidget.setObjectName("centralWidget")
    self.stackedWidget =   QtWidgets.QStackedWidget(self.centralWidget)
    self.stackedWidget.setGeometry(QtCore.QRect(9, 19, 391, 211))
    self.stackedWidget.setObjectName("stackedWidget")
    self.page = QtWidgets.QWidget()
    self.page.setObjectName("page")
    self.pushButton = QtWidgets.QPushButton(self.page)
    self.pushButton.setGeometry(QtCore.QRect(130, 120, 114, 32))
    self.pushButton.setObjectName("pushButton")
    self.label = QtWidgets.QLabel(self.page)
    self.label.setGeometry(QtCore.QRect(50, 20, 59, 16))
    self.label.setObjectName("label")
    self.stackedWidget.addWidget(self.page)
    self.page_2 = QtWidgets.QWidget()
    self.page_2.setObjectName("page_2")
    self.label_2 = QtWidgets.QLabel(self.page_2)
    self.label_2.setGeometry(QtCore.QRect(70, 70, 59, 16))
    self.label_2.setObjectName("label_2")
    self.pushButton_2 = QtWidgets.QPushButton(self.page_2)
    self.pushButton_2.setGeometry(QtCore.QRect(190, 120, 114, 32))
    self.pushButton_2.setObjectName("pushButton_2")
    self.stackedWidget.addWidget(self.page_2)
    MainWindow.setCentralWidget(self.centralWidget)
    self.menuBar = QtWidgets.QMenuBar(MainWindow)
    self.menuBar.setGeometry(QtCore.QRect(0, 0, 400, 22))
    self.menuBar.setObjectName("menuBar")
    MainWindow.setMenuBar(self.menuBar)
    self.mainToolBar = QtWidgets.QToolBar(MainWindow)
    self.mainToolBar.setObjectName("mainToolBar")
    MainWindow.addToolBar(QtCore.Qt.TopToolBarArea, self.mainToolBar)
    self.statusBar = QtWidgets.QStatusBar(MainWindow)
    self.statusBar.setObjectName("statusBar")
    MainWindow.setStatusBar(self.statusBar)

    self.retranslateUi(MainWindow)

    self.stackedWidget.setCurrentIndex(0)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)

def retranslateUi(self, MainWindow):
    _translate = QtCore.QCoreApplication.translate
    MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
    self.pushButton.setText(_translate("MainWindow", "PushButton"))
    self.label.setText(_translate("MainWindow", "PAGE 1"))
    self.label_2.setText(_translate("MainWindow", "PAG 2"))
    self.pushButton_2.setText(_translate("MainWindow", "Button 2"))
    self.pushButton.show()

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_())

我对Qt真的很陌生。并且我正在尝试为学校项目制作多页用户界面。任何人关于如何让我的按钮再次起作用的任何想法吗？

非常感谢！

编辑：ui文件：

        <?xml version="1.0" encoding="UTF-8"?>
    <ui version="4.0">
    <class>MainWindow</class>
    <widget class="QMainWindow" name="MainWindow">
    <property name="geometry">
    <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
    </rect>
    </property>
    <property name="windowTitle">
    <string>MainWindow</string>
    </property>
    <widget class="QWidget" name="centralWidget">
    <widget class="QStackedWidget" name="stackedWidget">
    <property name="geometry">
     <rect>
      <x>9</x>
      <y>19</y>
      <width>391</width>
      <height>211</height>
     </rect>
     </property>
     <property name="currentIndex">
     <number>0</number>
     </property>
     <widget class="QWidget" name="page">
     <widget class="QPushButton" name="pushButton">
      <property name="geometry">
       <rect>
        <x>130</x>
        <y>120</y>
        <width>114</width>
        <height>32</height>
       </rect>
      </property>
      <property name="text">
       <string>PushButton</string>
      </property>
     </widget>
     <widget class="QLabel" name="label">
      <property name="geometry">
       <rect>
        <x>50</x>
        <y>20</y>
        <width>59</width>
        <height>16</height>
       </rect>
      </property>
      <property name="text">
       <string>PAGE 1</string>
      </property>
     </widget>
     </widget>
     <widget class="QWidget" name="page_2">
     <widget class="QLabel" name="label_2">
      <property name="geometry">
       <rect>
        <x>70</x>
        <y>70</y>
        <width>59</width>
        <height>16</height>
       </rect>
      </property>
      <property name="text">
       <string>PAG 2</string>
      </property>
     </widget>
     <widget class="QPushButton" name="pushButton_2">
      <property name="geometry">
       <rect>
        <x>190</x>
        <y>120</y>
        <width>114</width>
        <height>32</height>
       </rect>
      </property>
      <property name="text">
       <string>Button 2</string>
      </property>
      </widget>
      </widget>
      </widget>
      </widget>
      <widget class="QMenuBar" name="menuBar">
      <property name="geometry">
      <rect>
      <x>0</x>
      <y>0</y>
      <width>400</width>
      <height>22</height>
       </rect>
      </property>
      </widget>
      <widget class="QToolBar" name="mainToolBar">
      <attribute name="toolBarArea">
      <enum>TopToolBarArea</enum>
      </attribute>
      <attribute name="toolBarBreak">
      <bool>false</bool>
      </attribute>
  </widget>
  <widget class="QStatusBar" name="statusBar"/>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>