蟒蛇3。 类，继承

Question

...
from PyQt4.QtGui import * 
from PyQt4.QtCore import *

class UserInfoModalWindow(QDialog): 
    def init(self):                                
        super(UserInfoModalWindow, self).init() 
        self.dialog_window = QDialog(self) 
        ... 
        self.dialog_window.exec_() 
        ... 
    def quit(self): 
        self.dialog_window.close()

...

class AcceptDialogWindow(UserInfoModalWindow):
    def init(self):
        super(UserInfoModalWindow, self).init() 
        self.accept_dialog = QDialog()
        ...
        self.accept_button = QPushButton()
        self.cancel_button = QPushButton()
        ... 
        self.connect(self.accept_button, 
                     SIGNAL('clicked()'), 
                     lambda: self.quit()) 
        self.connect(self.cancel_button, 
                     SIGNAL('clicked()'), 
                     self.accept_dialog.close)
        ... 
        self.accept_dialog.exec_() 
    ... 
    # From this method I want to call a method from a parent class 
    def quit(self): 
        self.accept_dialog.close() 
        return super(UserInfoModalWindow, self).quit()

When clicked 'cancel_button' - only accept_dialog closes, that's right, however when clicked 'accept_button' - accept_dialog AND dialog_window should be closed.

I get this error: File "app.py", line 252, in quit
return super(UserInfoModalWindow, self).quit() 
AttributeError: 'super' object has no attribute 'quit'

What is the issue? What did I do wrong?

Answer 1

Here:

return super(UserInfoModalWindow, self).quit()

You want:

return super(AcceptDialogWindow, self).quit()

super() first argument is supposed to be the current class (for most use case at least). Actually super(cls, self).method() means:

• get the mro of self
• locate class cls in the mro
• take the next class (the one after cls )
• execute the method from this class

So super(UserInfoModalWindow, self) in AcceptDialogWindow resolves to the parent of UserInfoModalWindow , which is QDialog .

Note that in Python 3.x, you don't have to pass any argument to super() - it will automagically do the RightThing(tm).