[Bf-python] udpdate enum

[Yuniel Castro González]

Hi for all.
I have an operator that shows an enum(combobox) with default element ('a' in this case), but I need change this value when I execute the operator (change 'a' by 'b' in this case). This is the idea but this operator doesn't satisfy me.
How can I do????
Thanks in advance.

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class OBJECT_OT_view_lists(bpy.types.Operator):
    bl_idname......
    
    subdivide = [('a','a','a')]
    subdivides = EnumProperty(name="Groups", description="Generated groups", items=subdivide)
    
    def draw(self, context):
        layout = self.layout
        row = layout.row()
        row.prop(self, 'subdivides')

    def execute(self, context):
        subdivide = [('b','b','b')]
        return {'FINISHED'}

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Yuniel