gremlin-python/src/main/python/gremlin_python/structure/io/graphsonV2d0.py [131:218]:
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        elif isinstance(obj, list):
            return [self.to_object(o) for o in obj]
        else:
            return obj


class _GraphSONTypeIO(object, metaclass=GraphSONTypeType):
    python_type = None
    graphson_type = None

    def dictify(self, obj, writer):
        raise NotImplementedError()

    def objectify(self, d, reader):
        raise NotImplementedError()


class _BytecodeSerializer(_GraphSONTypeIO):
    @classmethod
    def _dictify_instructions(cls, instructions, writer):
        out = []
        for instruction in instructions:
            inst = [instruction[0]]
            inst.extend(writer.to_dict(arg) for arg in instruction[1:])
            out.append(inst)
        return out

    @classmethod
    def dictify(cls, bytecode, writer):
        if isinstance(bytecode, Traversal):
            bytecode = bytecode.bytecode
        out = {}
        if bytecode.source_instructions:
            out["source"] = cls._dictify_instructions(bytecode.source_instructions, writer)
        if bytecode.step_instructions:
            out["step"] = cls._dictify_instructions(bytecode.step_instructions, writer)
        return GraphSONUtil.typed_value("Bytecode", out)

class TraversalSerializer(_BytecodeSerializer):
    python_type = Traversal


class BytecodeSerializer(_BytecodeSerializer):
    python_type = Bytecode


class VertexSerializer(_GraphSONTypeIO):
    python_type = Vertex
    graphson_type = "g:Vertex"

    @classmethod
    def dictify(cls, vertex, writer):
        return GraphSONUtil.typed_value("Vertex", {"id": writer.to_dict(vertex.id),
                                                   "label": writer.to_dict(vertex.label)})


class EdgeSerializer(_GraphSONTypeIO):
    python_type = Edge
    graphson_type = "g:Edge"

    @classmethod
    def dictify(cls, edge, writer):
        return GraphSONUtil.typed_value("Edge", {"id": writer.to_dict(edge.id),
                                                 "outV": writer.to_dict(edge.outV.id),
                                                 "outVLabel": writer.to_dict(edge.outV.label),
                                                 "label": writer.to_dict(edge.label),
                                                 "inV": writer.to_dict(edge.inV.id),
                                                 "inVLabel": writer.to_dict(edge.inV.label)})


class VertexPropertySerializer(_GraphSONTypeIO):
    python_type = VertexProperty
    graphson_type = "g:VertexProperty"

    @classmethod
    def dictify(cls, vertex_property, writer):
        return GraphSONUtil.typed_value("VertexProperty", {"id": writer.to_dict(vertex_property.id),
                                                           "label": writer.to_dict(vertex_property.label),
                                                           "value": writer.to_dict(vertex_property.value),
                                                           "vertex": writer.to_dict(vertex_property.vertex.id)})


class PropertySerializer(_GraphSONTypeIO):
    python_type = Property
    graphson_type = "g:Property"

    @classmethod
    def dictify(cls, property, writer):
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gremlin-python/src/main/python/gremlin_python/structure/io/graphsonV3d0.py [134:222]:
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        elif isinstance(obj, list):
            return [self.to_object(o) for o in obj]
        else:
            return obj


class _GraphSONTypeIO(object, metaclass=GraphSONTypeType):
    python_type = None
    graphson_type = None

    def dictify(self, obj, writer):
        raise NotImplementedError()

    def objectify(self, d, reader):
        raise NotImplementedError()


class _BytecodeSerializer(_GraphSONTypeIO):
    @classmethod
    def _dictify_instructions(cls, instructions, writer):
        out = []
        for instruction in instructions:
            inst = [instruction[0]]
            inst.extend(writer.to_dict(arg) for arg in instruction[1:])
            out.append(inst)
        return out

    @classmethod
    def dictify(cls, bytecode, writer):
        if isinstance(bytecode, Traversal):
            bytecode = bytecode.bytecode
        out = {}
        if bytecode.source_instructions:
            out["source"] = cls._dictify_instructions(bytecode.source_instructions, writer)
        if bytecode.step_instructions:
            out["step"] = cls._dictify_instructions(bytecode.step_instructions, writer)
        return GraphSONUtil.typed_value("Bytecode", out)


class TraversalSerializer(_BytecodeSerializer):
    python_type = Traversal


class BytecodeSerializer(_BytecodeSerializer):
    python_type = Bytecode


class VertexSerializer(_GraphSONTypeIO):
    python_type = Vertex
    graphson_type = "g:Vertex"

    @classmethod
    def dictify(cls, vertex, writer):
        return GraphSONUtil.typed_value("Vertex", {"id": writer.to_dict(vertex.id),
                                                  "label": writer.to_dict(vertex.label)})


class EdgeSerializer(_GraphSONTypeIO):
    python_type = Edge
    graphson_type = "g:Edge"

    @classmethod
    def dictify(cls, edge, writer):
        return GraphSONUtil.typed_value("Edge", {"id": writer.to_dict(edge.id),
                                                "outV": writer.to_dict(edge.outV.id),
                                                "outVLabel": writer.to_dict(edge.outV.label),
                                                "label": writer.to_dict(edge.label),
                                                "inV": writer.to_dict(edge.inV.id),
                                                "inVLabel": writer.to_dict(edge.inV.label)})


class VertexPropertySerializer(_GraphSONTypeIO):
    python_type = VertexProperty
    graphson_type = "g:VertexProperty"

    @classmethod
    def dictify(cls, vertex_property, writer):
        return GraphSONUtil.typed_value("VertexProperty", {"id": writer.to_dict(vertex_property.id),
                                                          "label": writer.to_dict(vertex_property.label),
                                                          "value": writer.to_dict(vertex_property.value),
                                                          "vertex": writer.to_dict(vertex_property.vertex.id)})


class PropertySerializer(_GraphSONTypeIO):
    python_type = Property
    graphson_type = "g:Property"

    @classmethod
    def dictify(cls, property, writer):
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