>>It is absolutely impossible that a large constrictor survived this past Northeastern winter (or any other winter) in the wild. <<
Could one live in the sewer system of a city or underneath an apartment building and feed on rats?
In the town next to me with a high Italian population, almost everyone lost their fig trees due to the cold. The blueberry bushes got hit really hard too. They already have the picking machines in the fields
Definitely could live on rats. I don't know anything about the temperature of a sewer system, but if the temperature were in the right range, I suppose so.