wikipedia (not always the best source for reptile info, but the first stuff I found to quote):

Breeders have recently begun working with an island lineage of Burmese Pythons. Early reports indicate that these "Dwarf" Burmese have a slightly different colouring and pattern than their mainland relatives and do not grow much over 2.1 metres (7 ft) long. The "Dwarf" Burmese were first captively reproduced by Beau Lewis of Arizona, USA.