import sys
from PySide2.QtCore import QObject, Signal


class Communicate(QObject):
    pass


class Communicate(Communicate):
    speak = Signal()
    talk = Signal()

    def __init__(self):
        super().__init__()
        self.speak.connect(self.say_hello)
        self.talk.connect(self.say_hi)

    def speaking_method(self):
        self.speak.emit()

    def talking_method(self):
        self.talk.emit()

    def say_hello(self):
        print("Hello")

    def say_hi(self):
        print("Hi")


someone = Communicate()
someone.speaking_method()
someone.talking_method()