@_CharlotteSP_ This is a juvenile black racer (Coluber constrictor ssp.). Harmless/nonvenomous. They'll lose this pattern and fade to black with age (after a year or so). They feed on anything they can overpower.
@Hideaki_Kokuoh It's a ball python. If they've abandoned it, then go to a pet store and buy a frozen rat. Thaw it out to room temp and drop it in there. Mine eats one rat a week. If you need any more help, just DM.