example.py

from galaxy import Galaxy


G = Galaxy([1,2,3,4,5,6])  # creates 6 universes
G.assert_(lambda x: x > 3)  # destroys universes 1,2,3
G.assert_(lambda x: x < 6)  # destroys universe 6

print(G.all())
print(G.any())

galaxy.py

"""
Inspired by https://github.com/karldray/quantum

Create by hltbra
"""

import random


class Galaxy(object):
    def __init__(self, universes):
        self._universes = universes

    def assert_(self, cond):
        new_universes = []
        for universe in self._universes:
            if cond(universe):
                new_universes.append(universe)
        self._universes = new_universes

    def any(self):
        return random.choice(self._universes)

    def all(self):
        return self._universes