user: Describe NodeEvaluateClosure(NodeInternal) from the Blender manual or Python API, including usage steps and snippets.

assistant: # NodeEvaluateClosure(NodeInternal)

base classes — [`bpy_struct`](bpy.types.bpy_struct.html#bpy.types.bpy_struct "bpy.types.bpy_struct"), [`Node`](bpy.types.Node.html#bpy.types.Node "bpy.types.Node"), [`NodeInternal`](bpy.types.NodeInternal.html#bpy.types.NodeInternal "bpy.types.NodeInternal")

*class* bpy.types.NodeEvaluateClosure(*NodeInternal*)
:   Execute a given closure

    active_input_index
    :   Index of the active item

        Type:
        :   int in [0, inf], default 0

    active_output_index
    :   Index of the active item

        Type:
        :   int in [0, inf], default 0

    define_signature
    :   This node defines a closure signature that should be used by other nodes

        Type:
        :   boolean, default False

    input_items
    :   Type:
        :   [`NodeEvaluateClosureInputItems`](bpy.types.NodeEvaluateClosureInputItems.html#bpy.types.NodeEvaluateClosureInputItems "bpy.types.NodeEvaluateClosureInputItems") [`bpy_prop_collection`](bpy.types.bpy_prop_collection.html#bpy.types.bpy_prop_collection "bpy.types.bpy_prop_collection") of [`NodeEvaluateClosureInputItem`](bpy.types.NodeEvaluateClosureInputItem.html#bpy.types.NodeEvaluateClosureInputItem "bpy.types.NodeEvaluateClosureInputItem"), (readonly)

    output_items
    :   Type:
        :   [`NodeEvaluateClosureOutputItems`](bpy.types.NodeEvaluateClosureOutputItems.html#bpy.types.NodeEvaluateClosureOutputItems "bpy.types.NodeEvaluateClosureOutputItems") [`bpy_prop_collection`](bpy.types.bpy_prop_collection.html#bpy.types.bpy_prop_collection "bpy.types.bpy_prop_collection") of [`NodeEvaluateClosureOutputItem`](bpy.types.NodeEvaluateClosureOutputItem.html#bpy.types.NodeEvaluateClosureOutputItem "bpy.types.NodeEvaluateClosureOutputItem"), (readonly)

    *classmethod* is_registered_node_type()
    :   True if a registered node type

        Returns:
        :   Result

        Return type:
        :   boolean

    *classmethod* input_template(*index*)
    :   Input socket template

        Parameters:
        :   **index** (*int in* *[**0**,* *inf**]*) – Index

        Returns:
        :   result

        Return type:
        :   [`NodeInternalSocketTemplate`](bpy.types.NodeInternalSocketTemplate.html#bpy.types.NodeInternalSocketTemplate "bpy.types.NodeInternalSocketTemplate")

    *classmethod* output_template(*index*)
    :   Output socket template

        Parameters:
        :   **index** (*int in* *[**0**,* *inf**]*) – Index

        Returns:
        :   result

        Return type:
        :   [`NodeInternalSocketTemplate`](bpy.types.NodeInternalSocketTemplate.html#bpy.types.NodeInternalSocketTemplate "bpy.types.NodeInternalSocketTemplate")

    *classmethod* bl_rna_get_subclass(*id*, *default=None*, */*)
    :   Parameters:
        :   **id** (*str*) – The RNA type identifier.

        Returns:
        :   The RNA type or default when not found.

        Return type:
        :   [`bpy.types.Struct`](bpy.types.Struct.html#bpy.types.Struct "bpy.types.Struct") subclass

    *classmethod* bl_rna_get_subclass_py(*id*, *default=None*, */*)
    :   Parameters:
        :   **id** (*str*) – The RNA type identifier.

        Returns:
        :   The class or default when not found.

        Return type:
        :   type