Banned no.
There are far more wide spreading, dangerous alien species out there right now than the big pythons, including kitty cats ;P.
Banning the sale of pythons wont stop a problem thats far bigger than just a couple specie of snakes limited to the southern end of florida.
Education and proper coverage of the care and purchase of any reptile or exotic pet is something that should be pushed. Somthing that alot of people are working towards right now.
Animal PLanet is on the bad list of alot of reptile owners at the moment for their portrayal of released reptiles. Their questionable testimony's and fluffery have shamed a channel I once respected. IMO.
There are other options than punishing those who are responsible for their animals than an outright ban.