this is my code below:

```
class Example(QWidget):

    def __init__(self, fname):
        self.fname=fname
        super().__init__()
        self.initUI()

    def initUI(self):

        #self.cb1 = QCheckBox('all',self)

        self.cb2 = QCheckBox('a',self)
        self.cb3 = QCheckBox('b',self)
        self.cb4 = QCheckBox('c',self)
        #for x in range(1, 13): 
         #   locals()['self.cb{0}'.format(x)] = QCheckBox('a',self)

        bt = QPushButton('submit',self) 

        self.resize(300,200)
        self.setWindowTitle('sheets selction')

```

I am trying to increment the `self.cb` by input amount of loop, so I want to increment the `self.cb` in the loop like `self.cb1`, `self.cb2`, `self.cb3` ..., I tried to use `locals()`, it works out of the PYQT, but when I try to use it in the `initUI`, it doesnt work, does anyone know how to increment it?