codewars/courses/python_oop/descriptor/ex_1.py

class ColourComponent:
    def __init__(self, start, end):
        self.start = start
        self.end = end

    def __get__(self, instance, owner_class):
        # print(f'__get__ called')
        return int(instance.hex[self.start:self.end], 16)

    def __set__(self, instance, value):
        # print('__set__ called')
        pass

class Colour:
    r = ColourComponent(1, 3)
    g = ColourComponent(3, 5)
    b = ColourComponent(5, 7)

    def __init__(self, hex):
        self.hex = hex

def test_colour():
    colour = Colour('#ff8823')
    print(colour.r)
    print(colour.g)
    print(colour.b)


#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class MaxLengthAttribute:

    def __get__(self, instance, owner_class):
        if instance.__dict__ == {}:
            return None
        return sorted(instance.__dict__.keys(), key= lambda x: (len(x), x), reverse=True)[0]




class MyClass:
    max_length_attribute = MaxLengthAttribute()

class JustClass:
    max_atr = MaxLengthAttribute()


def test_len():

    # obj = MyClass()
    # obj.name = "Vasiliy"
    # obj.city = "Saint Peterburg"
    # obj.country = "Rus"
    # print(obj.max_length_attribute)

    obj = JustClass()
    obj.mock = 15
    obj.city = "Saint Peterburg"
    obj.name = "Vasiliy"
    obj.door = 'wood'
    print(obj.max_atr)


if __name__ == '__main__':
    # test_colour()
    test_len()