Сигнал из дочернего окна MDI

import testfile02
from testfile02 import win02
 
class win01(QMainWindow):
    def __init__(self, parent=None):
        super(win01, self).__init__(parent)
        self.mdi=QMdiArea()
        self.setCentralWidget(self.mdi)
        self.mdi.setTabPosition(1)
        self.w02()
 
    def w02(self):
        self.button = QPushButton("open win02", self)
        self.button.move(100, 100)
        self.button.clicked.connect(self.show_t02)
 
    def show_t02(self):
        sub=QMdiSubWindow()
        sub.setWidget(win02())
        sub.setWindowTitle('Перечень проектов')
        self.mdi.addSubWindow(sub)
        self.mdi.setViewMode(1)  
        
        self.win02 = testfile02.win02(self) #1
        self.win02.clicked2.connect(self.func) #1
      
        sub.resize(1000,500)
        sub.show()
 
 
 
    def func(self):
        print("yes!")
 
 
if __name__ == "__main__":
    app = QApplication(sys.argv)
    ex = win01()
    ex.show()
    sys.exit(app.exec_())

class win02(QWidget):
    clicked2 = pyqtSignal()
 
    def __init__(self, parent=None):
        super(win02, self).__init__(parent)
        self.button = QPushButton("call to func")
        self.button.clicked.connect(self.clicked2)
        lay = QGridLayout(self)
        lay.addWidget(self.button)

class win02(QWidget):
    clicked2 = pyqtSignal()
    def __init__(self, parent=None):
        super(win02, self).__init__(parent)
        self.button = QPushButton("call to func")
        self.button.clicked.connect(self.clicked22)
        lay = QGridLayout(self)
        lay.addWidget(self.button)
    def clicked22(self):
        self.clicked2.emit()

import sys
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
 
class Child(QWidget):
    signal = pyqtSignal(list)
    def __init__(self, parent = None):
        super().__init__(parent)
        self.line = QLineEdit()
        self.box = QSpinBox()
        grid = QGridLayout(self)
        grid.addWidget(self.line)
        grid.addWidget(self.box)
    
    def mousePressEvent(self,e):
        self.signal.emit([self.box.value(),self.line.text()])
      
    
class MainWindow(QMainWindow):
    count = 0
    def __init__(self, parent = None):
      super().__init__(parent)
      self.mdi = QMdiArea()
      self.setCentralWidget(self.mdi)
      bar = self.menuBar()
      mnu = bar.addMenu("File")
      mnu.addAction("New")
      mnu.addAction("Cascade")
      mnu.addAction("Tiled")
      mnu.triggered[QAction].connect(self.windowaction)
      self.setWindowTitle("MDI demo")
      
    def on_child(self,value):
        print(self.sender(), value)
 
        
    def windowaction(self, q):
        if q.text() == "New":
            MainWindow.count = MainWindow.count+1
            sub = QMdiSubWindow()
            child = Child()
            child.signal.connect(self.on_child)
            sub.setWidget(child)
            sub.setWindowTitle("subwindow"+str(MainWindow.count))
            self.mdi.addSubWindow(sub)
            sub.show()
                
        if q.text() == "Cascade":
            self.mdi.cascadeSubWindows()
            
        if q.text() == "Tiled":
            self.mdi.tileSubWindows()
            
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = MainWindow()
    ex.show()
    sys.exit(app.exec_())