code: def _hashCoordinate(coordinate):
      
      coordinateStr = ",".join(str(v) for v in coordinate)
      # Compute the hash and convert to 64 bit int.
      hash = int(int(hashlib.md5(coordinateStr).hexdigest(), 16) % (2 ** 64))
      return hash
docs: Hash a coordinate to a 64 bit integer.