Проблема с изменением индекса QStackedWidget

Опишу свою проблему. Я использую PySide2, QtDesigner и Python. В QtDesigner я создал QStakedWidget и продвигал свои пользовательские страницы. Я использую предложенную здесь структуру проекта https://stackoverflow.com/a/53926554/14071081. Я хочу получить доступ window = MainWidget(), чтобы изменить currentIndex на 0 при нажатии кнопки в Add_Strategy_Page_Rule. Создание нового объекта MainWidget не работает, поэтому я подумал, что единственный способ - это как-то зацепить/импортировать window из mainWindow.py. Простой импорт main через import main в add_stratrgy_rule_page.py вызывает: экран из консоли Есть ли решение/трик для этого?

mainWindow.ui

<?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>1000</width>
    <height>600</height>
   </rect>
  </property>
  <property name = "minimumSize">
   <size>
    <width>1000</width>
    <height>600</height>
   </size>
  </property>
  <property name = "windowTitle">
   <string>MainWindow</string>
  </property>
  <property name = "styleSheet">
   <string notr = "true"/>
  </property>
  <widget class = "QWidget" name = "centralwidget">
   <property name = "minimumSize">
    <size>
     <width>1000</width>
     <height>600</height>
    </size>
   </property>
   <layout class = "QHBoxLayout" name = "horizontalLayout">
    <item>
     <widget class = "QStackedWidget" name = "widget_pages">
      <property name = "currentIndex">
       <number>1</number>
      </property>
      <widget class = "Strategy_Widget" name = "strategy_page">
       <layout class = "QHBoxLayout" name = "horizontalLayout_6">
        <property name = "spacing">
         <number>0</number>
        </property>
        <property name = "leftMargin">
         <number>0</number>
        </property>
        <property name = "topMargin">
         <number>0</number>
        </property>
        <property name = "rightMargin">
         <number>0</number>
        </property>
        <property name = "bottomMargin">
         <number>0</number>
        </property>
       </layout>
      </widget>
      <widget class = "Add_Strategy_Rule_Widget" name = "add_strategy_rule_page"/>
     </widget>
    </item>
   </layout>
  </widget>
 </widget>
 <customwidgets>
  <customwidget>
   <class>Strategy_Widget</class>
   <extends>QWidget</extends>
   <header>pages/strategy_page</header>
   <container>1</container>
  </customwidget>
  <customwidget>
   <class>Add_Strategy_Rule_Widget</class>
   <extends>QWidget</extends>
   <header>pages/add_strategy_rule_page</header>
   <container>1</container>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>

mainWindow.py

import os
from PySide2 import QtWidgets
from PySide2.QtUiTools import loadUiType

current_dir = os.path.dirname(os.path.abspath(__file__))
Form, Base = loadUiType(os.path.join(current_dir, "ui/mainWindow.ui"))

class MainWidget(Base, Form):
    def __init__(self, parent=None):
        super(self.__class__, self).__init__(parent)
        self.setupUi(self)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    app.setStyle("fusion")
    window = MainWidget()
    window.show()
    sys.exit(app.exec_())

Strategy_page.ui

<?xml version = "1.0" encoding = "UTF-8"?>
<ui version = "4.0">
 <class>Form</class>
 <widget class = "QWidget" name = "Form">
  <property name = "geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>1003</width>
    <height>666</height>
   </rect>
  </property>
  <property name = "sizePolicy">
   <sizepolicy hsizetype = "Expanding" vsizetype = "Expanding">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name = "windowTitle">
   <string>Form</string>
  </property>
  <property name = "styleSheet">
   <string notr = "true"/>
  </property>
  <layout class = "QHBoxLayout" name = "horizontalLayout">
   <item>
    <widget class = "QLabel" name = "label">
     <property name = "text">
      <string>Strategy Page</string>
     </property>
    </widget>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

Strategy_page.py

import os
from PySide2 import QtGui
from PySide2.QtUiTools import loadUiType

current_dir = os.path.dirname(os.path.abspath(__file__))
Form, Base = loadUiType(os.path.join(current_dir, "../ui/strategy_page.ui"))


class Strategy_Widget(Base, Form):
    buy_stackedWidget_object = None
    def __init__(self, parent=None):
        super(self.__class__, self).__init__(parent)
        self.setupUi(self)

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    w = Strategy_Widget()
    w.show()
    sys.exit(app.exec_())

add_strategy_rule_page.ui

<?xml version = "1.0" encoding = "UTF-8"?>
<ui version = "4.0">
 <class>Form</class>
 <widget class = "QWidget" name = "Form">
  <property name = "geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>880</width>
    <height>454</height>
   </rect>
  </property>
  <property name = "sizePolicy">
   <sizepolicy hsizetype = "Expanding" vsizetype = "Expanding">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name = "windowTitle">
   <string>Form</string>
  </property>
  <property name = "styleSheet">
   <string notr = "true"/>
  </property>
  <layout class = "QVBoxLayout" name = "verticalLayout">
   <property name = "spacing">
    <number>0</number>
   </property>
   <property name = "sizeConstraint">
    <enum>QLayout::SetDefaultConstraint</enum>
   </property>
   <property name = "leftMargin">
    <number>0</number>
   </property>
   <property name = "topMargin">
    <number>0</number>
   </property>
   <property name = "rightMargin">
    <number>0</number>
   </property>
   <property name = "bottomMargin">
    <number>0</number>
   </property>
   <item>
    <widget class = "QLabel" name = "label">
     <property name = "text">
      <string>Add strategy rule page</string>
     </property>
    </widget>
   </item>
   <item>
    <widget class = "QPushButton" name = "pushButton">
     <property name = "text">
      <string>PushButton</string>
     </property>
    </widget>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

add_strategy_rule_page.py

import os
from PySide2 import QtGui
from PySide2.QtUiTools import loadUiType

current_dir = os.path.dirname(os.path.abspath(__file__))
Form, Base = loadUiType(os.path.join(current_dir, "../ui/add_strategy_rule_page.ui"))


class Add_Strategy_Rule_Widget(Base, Form):
    def __init__(self, parent=None):
        super(self.__class__, self).__init__(parent)
        self.setupUi(self)
        self.pushButton.clicked.connect()

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    w = Add_Strategy_Rule_Widget()
    w.show()
    sys.exit(app.exec_())