By the way, unless I missed a post, how did you determine that it's a female? You don't even know what species it is.
You do realize that snakes are like mice and cockroaches, just because you only see one doesn't mean that there are not 50 more that are much smarter and are not getting spotted. Get your welding gloves out and grab that sucker pulling it slowly so you can determine which way the head is coming out so you can get a grip on the head end. The way it twisted and powered it's way out it is a feisty "pissed on" snake. Get it out and seriously I would run a true "plumbers" snake down every drain and toilet in the place just as a "feel good move"
How much f@cking Velveeta did you eat to poop out a tapeworm like that ? (sorry I'm late to this party)
Everything about this animal says anaconda. Could be a deadly sea snake though. How far from the ocean are you? I showed this thread to my pops and he said "no wonder the house was for sale". He also suggested vice grips.
Whats the location? I can probably eliminate all the venomous snakes from your area based on that picture if I knew where (state?). Its a damn rat snake tho, just grab it and pull it out and your nightmare is over for now.