How to add Inputs and Outputs to Group Node using Python

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Hi GoldenDragon,

in Blender 4.0 the inputs and outputs got removed from the NodeTree
Now you have to add them to the NodeTree interface. Here’s a modified version of your function:

Code 
def create_custom_node_group():
    
    # Create new node group
    group = bpy.data.node_groups.new('custom group', 'ShaderNodeTree')
    
    # Define interface
    color_input = group.interface.new_socket(
        name="Color",
        description="Color input",
        in_out='INPUT',
        socket_type='NodeSocketColor'
    )
    color_input.default_value = (1.0, 1.0, 1.0, 1.0)
    
    color_output = group.interface.new_socket(
        name="Color",
        description="Color output",
        in_out='OUTPUT',
        socket_type='NodeSocketColor'
    )
    color_output.default_value = (0.0, 0.0, 0.0, 1.0)
    
    # Create nodes
    nodes = group.nodes
    group_in = nodes.new(type='NodeGroupInput')
    group_in.location = (-200, 0)

    group_out = nodes.new(type='NodeGroupOutput')
    group_out.location = (200, 0)
    
    mix_node = nodes.new(type='ShaderNodeMix')
    mix_node.location = (0, 0)
    mix_node.data_type = 'RGBA'
    mix_node.inputs[0].default_value = 0.6
    mix_node.inputs[7].default_value = (0.0, 1.0, 0.0, 1.0)

    # Create links
    links = group.links
    links.new(group_in.outputs[0], mix_node.inputs[6])
    links.new(mix_node.outputs[2], group_out.inputs[0])

    return group