Куда пропал метод?

from PyQt5.QtCore import QObject, pyqtSignal
 
class Foo(QObject):
 
    # Define a new signal called 'trigger' that has no arguments.
    trigger = pyqtSignal()
 
    def connect_and_emit_trigger(self):
        # Connect the trigger signal to a slot.
        self.trigger.connect(self.handle_trigger)

from PyQt5 import QtWidgets
from PyQt5.QtCore import QObject, pyqtSignal
 
class Foo(QObject):
    sig = pyqtSignal()
    def cnct(self):
        self.sig.c

import MyForm
class MyWindow(QtWidgets.QMainWindow):
    def __init__(self, parent =  None):
        QtWidgets.QWidget.__init__(self, parent)
        self.ui = MyForm.Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.Button_1.clicked.connect(click_processing)

from PyQt5.QtCore import QObject, pyqtSignal, QCoreApplication
 
 
class Foo(QObject):
    trigger = pyqtSignal(str)
 
    def __init__(self):
        super().__init__()
        self.connect_and_emit_trigger()
        self.trigger.emit('ff')
 
    def connect_and_emit_trigger(self):
        # Connect the trigger signal to a slot.
        self.trigger.connect(self.handle_trigger)
 
    def handle_trigger(self):
        print('trigger')
        exit()
 
 
app = QCoreApplication([])
f = Foo()
app.exec()