The giant snake in the video is someone’s pet, an albino python named Julius. According to the video uploader, Jenner:
Bored of being in a dark room, she flips on the light, opens the door and bails.
This particular episode takes place at 1am.
This is why we keep doors locked with her around. We don’t need her harassing the neighbors.
Sadly Julius passed in 2012 due to an infection, according to Jenner’s comments on her other videos.