import fire
class Tools(object):
     def __init__(self):
         self.calculator = Calculator()
         self.widget = Widget()
if __name__== '__main__':
      fire.Fire(Tools)
# The CLI that Fire generates looks allows us to access the respective classes and class methods 
> tools calculator add 1 2 # 3
> tools calculator multiply 3 4 # 12
> tools 
Usage: tools calculator 
       tools widget