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import bpy

class SubsurfSet(bpy.types.Operator):
    '''TODO, doc.'''

    bl_idname = "object.subsurf_set"
    bl_label = "Subsurf Set"
    bl_register = True
    bl_undo = True
    
    level = bpy.props.IntProperty(name="Level",
            default=1, min=0, max=6)

    def poll(self, context):
        ob = context.active_object
        return (ob and ob.type == 'MESH')

    def execute(self, context):
        level = self.properties.level
        ob = context.active_object
        for mod in ob.modifiers:
            if mod.type == 'SUBSURF':
                if mod.levels != level:
                    mod.levels = level
                return ('FINISHED',)
        
        # adda new modifier
        bpy.ops.object.modifier_add(type='SUBSURF') # TODO, support adding directly
        mod = ob.modifiers[-1]
        mod.levels = level
        return ('FINISHED',)


# Register the operator
bpy.ops.add(SubsurfSet)