def __init__(self, **kwargs):
    self.add_widget(type='button', text='Button1', command_func=(lambda e: print('Button1 working!')))
    self.test_lbl = self.add_widget(type='label', text="Here's an awesome label!")
    self.add_widget('btn', 'Update Label', command_func=self.update_lbl)
def __init__(self, **kwargs):
    self.add_widget(type='button', text='Button1', command_func=(lambda e: print('Button1 working!')))
    self.test_lbl = self.add_widget(type='label', text="Here's an awesome label!")
    self.add_widget('btn', 'Update Label', command_func=self.update_lbl)