immutable

immutable.py

class Point:
    def __init__(self, x, y):
        super().__setattr__('x', x)    # workaround for the
        super().__setattr__('y', y)    # rule below
        
    def __repr__(self):
        return f'Point({self.x}, {self.y})'
    
    def __eq__(self, other):
        return self.x == other.x and self.y == other.y
    
    def __hash__(self):
        return hash((self.x, self.y))

    def __setattr__(self, k, v):      # no assignments! 
        raise TypeError("'Point' object does not support item assignment")
    
>>> p = Point(1, 2)
>>> print(p)
Point(1, 2)
>>> p.x = 3
TypeError: 'Point' object does not support item assignment