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I am trying to remove the unconnected sockets of Group Output node using python, I tried this -

import bpy

obj = bpy.context.active_object
for mat in obj.data.materials:
    node_tree = mat.node_tree.nodes
    for node in node_tree:
        if node.name.startswith('Textures'):
            group_nodes = node.node_tree.nodes
            for node in group_nodes:
                if node.type == 'GROUP_OUTPUT':
                    output_node = node
                    sockets = output_node.inputs
                    for socket in sockets:
                        if socket.is_linked == False:
                            sockets.remove(socket)

But I am getting this error - RuntimeError: Error: Unable to remove socket from built-in node If anyone can help explain me why this method does not work, and how to remove it

Screenshot

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1 Answer 1

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With the Blender 4.0 they made a changed they way how node sockets can be added removed, linked etc. - https://developer.blender.org/docs/release_notes/4.0/python_api/#node-groups

import bpy

for node_group in bpy.data.node_groups:
    if "Textures" in node_group.name:
        group_output = next((node for node in node_group.nodes 
                                if node.type == 'GROUP_OUTPUT'), None)

        if group_output:
            # Collect names of unlinked inputs, skipping empty names
            unlinked_socket_names = [
                socket.name
                for socket in group_output.inputs
                if not socket.links and socket.name.strip() != ""
            ]

            print(f"Unlinked sockets in '{node_group.name}': {unlinked_socket_names}")
        else:
            print(f"No Group Output node found in '{node_group.name}'")

        #Remove unsed sockets
        for item in list(node_group.interface.items_tree):
            if (item.item_type == 'SOCKET' and item.in_out == 'OUTPUT' and item.name in unlinked_socket_names):
                node_group.interface.remove(item)
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    $\begingroup$ Glad you found the solution. Thank you for sharing :) $\endgroup$ Commented Feb 23 at 14:07

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