When Use @Slot(), sender has NoneType.

klyjm

Recently, I find when I use @Slot() before a function, the sender() in function will return NoneType. And if I don't use it, everything is OK, is this a bug?

@Slot()
def select_leg_button_clicked(self):
    self.repaint()
    button = self.sender()

Just like this, the button will be NoneType.
But if I don't use slot, just like:

#@Slot()
def select_leg_button_clicked(self):
    self.repaint()
    button = self.sender()

sender() works well. Is this a bug? Because the example for Pyside2 says we should use @Slot() to reduce some error.

klyjm

I use connect to connect the signal and slot,.In my code, it is a radiobutton, here is my code:

self.left_button = QRadioButton('l')
self.left_button.clicked.connect(self.select_leg_button_clicked)

This is also the recommended way to connect signal and slot, I think I'm using Signals/Slots. Is there any wrong?