I’m new using tkinter and I’ve run into a following issue.
In the init method of my class APP I’m creating a couple a label and a button with the handler that should change the label text

def __init(self):
    ....
    self.label = ttk.Label(frame, text='some text')
    self.button = tk.Button(frame, command='lambda: self.change())

def change():
    if (hasattr(App, 'label'):
    self.label.configure(text='Other text')

and I’m getting the error

App.label.configure(text=cn)     
AttributeError: 'NoneType' object has no attribute 'configure'

Why is the label element losing its object?

I expect the label attribute to retain the assigned value but it does not seem to do that