Object oriented Python for Ross

test.py

import numpy as np

class Catalog(object):
    def __init__(self):
        self.stars = []

    def add_star(self, star):
        self.stars.append(star)

    @property
    def fluxes(self):
        return np.array([[s.ra, s.flux] for s in self.stars])

    @fluxes.setter
    def fluxes(self, fluxes):
        for i, s in enumerate(self.stars):
            s.flux = fluxes[i]

    def __getitem__(self, ind):
        return self.stars[ind]

class Star(object):
    def __init__(self, ra, dec, flux):
        self.ra   = ra
        self.dec  = dec
        self.flux = flux

class RRLyrae(Star):
    def __init__(self, period, *args, **kwargs):
        super(RRLyrae, self).__init__(*args, **kwargs)
        self.period = period