Hydrogen Peroxide is no longer recommended for puncture wounds or any deeper wounds. It really is not recommended for cleaning wounds. Apparently it also kills healthy cells and inhibits healing. Especially if in contact with the wound for any length of time.I'm pretty confident that big constrictors like anacondas are likely to give you a bite that needs treatment.
Am no expert but would suspect that most small, non venomous snakes in the US aren't apt to cause great concern, wash the bite area, hydrogen peroxide and antibiotic ointment and I'd think you'd be OK. Any signs of redness or swelling, head to your PCPs office. Don