Wait, keeping still. Provided you are at a safe distance from the snake, stop and let the snake move on.  If the snake has realized you are there, it will often leave of its own accord while you aren't making any movement, to avoid you.  However, if the snake proves stubborn in its wish to stay where it is, leave it alone and walk around it at a safe distance. If you cannot go around the snake due to the path being the only way forward, try stomping the ground on the spot, to produce more vibrations.  However, only do this if you are a very safe (long) distance away from the snake, as stomping movement and vibrations can be perceived by the snake as a threat and it may strike instead of move. 
A snake has a short attention span, usually lasting less than a minute. Hence, once it has slithered away from you, it has forgotten about you and goes about its business elsewhere. It's not harbouring thoughts of coming back to chase you.
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