constructor.py

import functools, inspect

def constructor(__init__):
    @functools.wraps(__init__)
    def new_init(self, *args, **kwds):
        bound_args = inspect.signature(__init__).bind(*args, **kwds)
        bound_args.apply_defaults()
        for k, v in bound_args.arguments.items():
            setattr(self, k, v)
    return new_init

class Point:
    @constructor
    def __init__(x, y, z):
        """Constructs a Point object.
        
        x - the x coordinate
        y - the y coordinate
        z - the z coordinate
        """
        
p = Point(1, 2, 3)
print(p.x, p.y, p.z) #=> 1 2 3