incubation temps and sex

Does incubation temps effect sex? My first clutch was mostly males and a buddy who is really into reptiles but not specificly ball pythons was telling me that my temps might have been a little low causing a mostly male clutch. I didnt think it worked like that for balls but I guess I dont know for sure.

Some reptiles; yes.
Ball pythons; no.

I've read some speculation here, a link to a paper there... You'd have to do some really long-term testing with some big numbers to prove anything. We'd probably know by now. However, these snakes seem far less understood than other animals.