An investigative reporter at the Chronicle reports that Burmese pythons could slither their way from Florida to the Bay Area in just 12 years. The 250-pound, alligator-swallowing snakes find our climate congenial, and could arrive sooner if introduced here by irresponsible pet owners. What the Chronicle missed: Unlike other cold-blooded threats to our way of life, Burmese pythons won't drive up rents.