code: def encode_single(self, typ: TypeStr, arg: Any) -> bytes:
          
          encoder = self._registry.get_encoder(typ)
  
          return encoder(arg)
docs: Encodes the python value ``arg`` as a binary value of the ABI type
          ``typ``.
  
          :param typ: The string representation of the ABI type that will be used
              for encoding e.g. ``'uint256'``, ``'bytes[]'``, ``'(int,int)'``,
              etc.
          :param arg: The python value to be encoded.
  
          :returns: The binary representation of the python value ``arg`` as a
              value of the ABI type ``typ``.