Python - getitem/setitem, getattr/setattrib, property

class Animal:

    # it has to be created this way
    # because `self.properties = {}` calls __setattr__
    # which uses `self.properties[]` so it calls __getattr__
    # which uses `self.properties[]` so it calls __getattr__ again
    properties = {}

    def __init__(self, **kwargs):
        print("\n  RUN: self.properties.update(kwargs)")
        self.properties.update(kwargs)

        #print("\n  RUN: self.properties = kwargs")
        #self.properties = kwargs # it calls __setattr__ which calls __getattr__ again and again

        print("\n  RUN: self.other = 'Hello World!'")
        self.other = 'Hello World!'

    # --- dictionary ---

    # ie. dog['tail'] = 1
    # ie. print( dog['tail'] )

    def __getitem__(self, key):
        print('DEBUG: __getitem__', key)
        return self.properties[key]

    def __setitem__(self, key, value):
        print('DEBUG: __setitem__', key, value)
        self.properties[key] = value

    # --- attribute ---

    # ie. dog.tail = 1
    # ie. print( dog.tail )

    def __getattr__(self, key):
        print('DEBUG: __getattr__', key)
        #return self.properties.get(key, None)
        return self.properties[key]

    def __setattr__(self, key, value):
        print('DEBUG: __set__', key, value)
        self.properties[key] = value

    # --- property ---

    # ie. dog.color = "silver"
    # ie. print( dog.color )

    @property
    def color(self):
        print('DEBUG: color getter')
        return self.properties

    @color.setter
    def color(self, value):
        print('DEBUG: color setter', value)
        self.properties['color'] = value

# --- main ---

dog = Animal(legs=4, tail=1, head=1)

print("\n  RUN: dog.color['new_dog'] = 'Brown'")
dog.color['new_dog'] = 'Brown'

print("\n  RUN: print(dog.new_dog)")
print(dog.new_dog)

print("\n  RUN: print(dog['new_dog'])")
print(dog['new_dog'])

print("\n  RUN: dog['new_dog'] = 'Orange'")
dog['new_dog'] = 'Orange'

print("\n  RUN: dog.new_dog = 'Blue'")
dog.new_dog = 'Blue'

print("\n  RUN: dog.color = 'Red'")
dog.color = 'Red'

print("\n  RUN: print(dog.color)")
print(dog.color)