Python data model example

python_dunder_example.py

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __str__(self):
        return 'Stringified Point: ({x}, {y})'.format(x=self.x, y=self.y)

    def __repr__(self):
        return 'Representing Point: ({x}, {y})'.format(x=self.x, y=self.y)

    def __add__(self, other):
        return Point(self.x + other.x, self.y + other.y)

    def __eq__(self, other):
        # custom comparison
        return self.x == other.x and self.y == other.y

    def __getattr__(self, attr):
        if (attr == 'X'):
            return self.x
        elif (attr == 'Y'):
            return self.y
        else:
            raise AttributeError('Point object has no attribute {attr}'.format(attr=attr))

    def __getitem__(self, index):
        if index == 0:
            return self.x
        elif index == 1:
            return self.y
        else:
            raise IndexError('No item found with index {index}'.format(index=index))