The netting in the photo is plastic garden fence material. The holes are 1" x 1". The netting was stapled to block access to a shelf in the barn. I had a broody who insisted on sitting on eggs up there, so I moved her to a lower shelf and put up the netting to discourage her from trying again.That netting is much smaller than what I've been using. I see you have it fastened vertically. I thought you were supposed to kind of crumple it up and lay it on the ground? I'm on my way to town so I'll pick some up larger screen. Correction. Larger than I've been using! What size is it and how big was the snake?
The netting I usually use for snakes is black plastic and made for covering fruit trees. I wad up the netting and put it along the bottom of my pens to keep snakes out. They crawl in and get tangled.