带有来自其他模块的发射信号的PYQT5问题

Question

class A(QObject):
    def __init__(self):
        super(A, self).__init__()
        self.work = Worker(self)
        self.work.finished.connect(self.ppp)

    def ppp(self):
        print(6)

我不知道发生了什么事？ 我尝试从模块发射信号，然后在B模块中连接函数 但是该功能没有被调用 而且没有出现错误

class Worker(QObject):
  # give worker class a finished signal
    finished = pyqtSignal()
    def __init__(self, parent=None):
        QObject.__init__(self, parent=parent)
        self.continue_run = True  # provide a bool run condition for the class

    def send(self):
        self.finished.emit()