You will find Spotted or Children's pythons to be very easy and very docile as adults. They get about 4ft or so and have a body girth like a big Florida king (females can get more girthy than that.) Too bad there are no striking color morphs.
I more recently got a baby Savu python (Indonesia). The snake is active when held but doesn't thrash and has never tried to bite. He eats like a champ right in front of me while I'm servicing his cage. I hear that Savus get about 4-5 ft and stay somewhat slender. Neat animal, I really like him. Maintenance has been a piece of cake thus far.
If you don't mind a 6ft plus snake, carpet pythons are a pleasure.
I like the looks of ball pythons but find them exceedingly boring as captives IMO. They still make good pets though. They sometimes go off feed but it is never a problem.
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Mark G