I believe (please correct) that the simplest differentiation is that they're a constrictor that gives birth to live young, vs. egg laying.
thats what i thought too. however these snakes have been refered to as boids twice in this thread but they are egg laying pythons, therefore not boids if my understanding is correct.
0.1 IJ carpet python
1.1 childrens pythons
0.1 crested
1.0 three toed box turtle
1.0 aussie shepherd
1.0 chupacabra/hyena dog thing.
1.2 strange cats
0.2 stranger children
0.1 even stranger GF