在我的pyside6项目中，以下代码可以工作：

# in main.py
if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = mainWindow.MainWindow()
    controller = control.Controller(window)
    window.show()
    sys.exit(app.exec())

# in control.py
class Controller(QObject):
    def __init__(self, main_window):
        self.main_window = main_window

        self.main_window.ui.action_Open.triggered.connect(lambda: file.open_file(self.main_window, self.target_data, self.file_target))
        self.main_window.fileOpenDoneSignal.connect(self.setup_model_view)

    def setup_model_view(self):
    #setting up the model and view from the data in the new file

# in mainWindow.py
class MainWindow(QMainWindow):
    fileOpenDoneSignal = Signal()
    def __init__(self):
        super().__init__()
        self.ui = ui_mainWindow.Ui_MainWindow()
        self.ui.setupUi(self)

# in file.py
def open_file(caller_obj, df, target):
    # some procedure to open a new file
    caller_obj.fileOpenDoneSignal.emit()

不过如果我想把信号移动到控制器层级：

# in control.py
class Controller(QObject):
    fileOpenDoneSignal = Signal()
    def __init__(self, main_window):
        self.main_window = main_window

        self.main_window.ui.action_Open.triggered.connect(lambda: file.open_file(self, self.target_data, self.file_target))
        self.fileOpenDoneSignal.connect(self.setup_model_view)

    def setup_model_view(self):
        #setting up the model and view from the data in the new file

# in mainWindow.py
class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.ui = ui_mainWindow.Ui_MainWindow()
        self.ui.setupUi(self)

这将不起作用，错误：Signal source has been deleted
能否告诉我发生了什么？现在位于 file.open_file 的信号源难道不应该在控制器作用域内运行吗？到底删掉了什么？
我在考虑把所有信号和控件都移到控制器中，是否有合适的方法可以把信号移动到控制器？还是应该把它保留在 MainWindow 对象中？

我正在使用pyside6 6.11.1，是否仍然是BUG: PySide6 6.9+ “Signal source has been deleted” #24825 https://github.com/spyder-ide/spyder/issues/24825 中提到的那个错误？

解决方案

感谢musicamante和 ekhumoro，控制器类上缺少的 super().__init__() 是问题所在。现在运行正常。

musicamante，感谢指出我应该以更恰当的方式提问。下面给出一个最小可复现的代码，控制器中的信号可以正常工作：

# main.py

import sys
from PySide6.QtWidgets import QApplication
from test_signal import mainWindow, control

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = mainWindow.MainWindow()
    controller = control.Controller(window)
    window.show()
    sys.exit(app.exec())

# mainWindow.py

from PySide6.QtWidgets import QMainWindow
from PySide6.QtGui import QAction

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.resize(600, 400)
        menu_bar = self.menuBar()
        file_menu = menu_bar.addMenu("&File")
        self.open_action = QAction("&Open...", self)
        file_menu.addAction(self.open_action)

# control.py

from PySide6.QtCore import QObject, Signal
from test_signal import file

class Controller(QObject):
    fileOpenDoneSignal = Signal()
    def __init__(self, main_window):
        super().__init__()
        self.main_window = main_window
        self.main_window.open_action.triggered.connect(lambda: file.open_file(self))
        self.fileOpenDoneSignal.connect(self.display_file)

    def display_file(self):
        print("Signal received")

# file.py

def open_file(caller):
    caller.fileOpenDoneSignal.emit()