Обмен данными между двумя формами pyqt5

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Объясните как обмениваться данными между формами ?? Почему по клику

self.pushButton.clicked.connect(self.aboutshow)

Вызывается функция aboutshow() отрабатывает вроде правильно

def aboutshow(self):
        strq = self.lineEdit.text()
        self.MyWin = StartMyMain()
        self.MyWin.obr(strq)
        print(strq)
        self.close()

Передает данные в главный класс методу obr()

def obr(self,strs):
        if strs:
            self.ui.lineEdit.setText(strs)

Но в текстовом поле не отображается наша переменная strs. Очень прошу объясните почему? Учу питон недавно и работа моя от программирования далека, так что сильно не пинайте за такие вопросы.

Весь код целиком main.py

#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys
import time
from gui import *
from gui2 import *
from PyQt5 import QtCore, QtGui, QtWidgets


class AboutUs(QtWidgets.QMainWindow, Ui_Form):
    def __init__(self,parent=None):
        super().__init__(parent, QtCore.Qt.Window)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.aboutshow)


    def aboutshow(self):
        strq = self.lineEdit.text()
        self.MyWin = StartMyMain()
        self.MyWin.obr(strq)
        print(strq)
        self.close()


class StartMyMain(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.AboutUs = None
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.uiAbout = AboutUs()
        self.ui.pushButton.clicked.connect(self.trik)


    def trik(self):
        self.aboutshow1 = AboutUs()
        self.aboutshow1.show()


    def obr(self,strs):
        if strs:
            self.ui.lineEdit.setText(strs)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    myapp = StartMyMain()
    myapp.show()
    sys.exit(app.exec_())

gui.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'gui.ui'
#
# Created by: PyQt5 UI code generator 5.5
#
# 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(488, 352)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(30, 20, 421, 51))
        self.lineEdit.setObjectName("lineEdit")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(120, 90, 251, 28))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 488, 26))
        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.pushButton.setText(_translate("MainWindow", "Вызвать форму"))

gui2.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'gui2.ui'
#
# Created by: PyQt5 UI code generator 5.5
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(60, 130, 281, 28))
        self.pushButton.setObjectName("pushButton")
        self.lineEdit = QtWidgets.QLineEdit(Form)
        self.lineEdit.setGeometry(QtCore.QRect(20, 50, 351, 51))
        self.lineEdit.setObjectName("lineEdit")
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(80, 10, 291, 31))
        self.label.setStyleSheet("font: 14pt \"MS Shell Dlg 2\";")
        self.label.setObjectName("label")

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.pushButton.setText(_translate("Form", "Отобразить в главной форме"))
        self.label.setText(_translate("Form", "Тут пишем текст"))

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