你想捕获信号并将其绑定到你的正确组件（例如绑定到一个函数），这样当信号被抛出时，它将调用相应的函数
举个例子：

class Main(QMainWindow):
        def __init__(self, parent=None):
            super().__init__()
            generalLayout = QHBoxLayout()
            centralWidget = QWidget()
            centralWidget.setLayout(generalLayout)
            self.setCentralWidget(centralWidget)
    
            left = Left()
            right = Right() 
            left.signal.connect(right.increment_spinbox_size) // connect left signal to a funcction inside right that will increase the size of the spinbox
            generalLayout.addLayout(left)
            generalLayout.addLayout(right)
            self.setLayout(generalLayout)

class Right(QVBoxLayout):
        def __init__(self, initial_value):
            super().__init__()
            self.spinbox = QSpinBox()
            self.addWidget(self.spinbox)
    
        def increment_spinbox_size(self):
            current_value = self.spinbox.value()
            self.spinbox.setValue(current_value + 1)

我使用父主类中的lambda函数调用另一个函数，该函数将更改第二个窗口中声明的类的值，从那里我可以访问另一个文件中的变量。需要导入Secondwww.example www.example.com
www.example. com 文件：

from Settings import Variables #Important to import your file.py of new window to access variables from there.

class CSettings(QMainWindow): #I created the widget class before the function of the main class, which will refer to the new Window.
    def __init__(self, parent=None):
        super(CSettings, self).__init__(parent)

        self.window = QtWidgets.QMainWindow()  
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self.window)
        self.window.show()

class MWindow(QMainWindow):
    def __init__(self):
        super(MWindow, self).__init__()

        self.setCentralWidget(self.Parent)

        navbar = QToolBar()
        self.addToolBar(navbar)

        Settings_btn = QAction('⌬', self)  #create an example button
        Settings_btn.triggered.connect(self.Settings) #importantly, the lambda function will be called when I click the button and it will call the Settings function.
        navbar.addAction(Settings_btn)

        self.show()

    def Settings(self):
    Variables.needExit=False #From here I can access and define variables from another .py file in the case Settings.py

www.example. com 文件：

class Variables(object): #The class that contains the variable.

    needExit=False

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
    
      the remainder of the code...