Python and boa species are seperated by family classification, pythonidae vs boidae

All species of pythonidae lay eggs, most species of boidae give live birth. I'm not an expert in comparing the two families of snakes, but a quick bit of searching came across this--

From wikipedia:
"Boids are, however, distinguished from the pythons in that none have postfrontal bones or premaxillary teeth, and that they give birth to live young. When labial pits are present, these are located between the scales as opposed to on them. Also, their geographical distributions are almost entirely mutually exclusive. In the few areas that they do coexist, the tendency is for them to occupy different habitats."