def get_random_parents(self, rng: Random) -> Tuple[bytes, bytes]:
""" Get parents from self.parents plus a random choice from self.parents_any to make it 3 in total.
Using tuple as return type to make it explicit that the length is always 2.
"""
assert len(self.must_include) <= 1
fill = rng.ordered_sample(self.can_include, 2 - len(self.must_include))
p1, p2 = self.must_include[:] + fill
return p1, p2
def get_random_parents(self, rng: Random) -> Tuple[bytes, bytes, bytes]:
""" Get parents from self.parents plus a random choice from self.parents_any to make it 3 in total.
Return type is tuple just to make it clear that the length is always 3.
"""
assert 1 <= len(self.parents) <= 3
more_parents = rng.ordered_sample(self.parents_any,
3 - len(self.parents))
p1, p2, p3 = self.parents[:] + more_parents
return p1, p2, p3