SampleBlenderAddon_2.py

import bpy
import bmesh

bl_info = {
    "name": "TomoG_Sample",
    "author": "TomoG",
    "version": (1, 0),
    "blender": (2, 9, 0),
    "location": "",
    "description": "sample",
    "warning": "",
    "support": "TESTING",
    "wiki_url": "",
    "tracker_url": "",
    "category": "Object"
}

class EdgeSplitTool(bpy.types.Operator):
    bl_idname = "mesh.edgesplittool"
    bl_label = "Edge Split Test Labl"
    bl_description = "Edge Split Desc"
    bl_options = {'REGISTER', 'UNDO'}
    
    def execute(self,context):
        bm = bmesh.from_edit_mesh(bpy.context.active_object.data)
        for s in bm.select_history:
            print(s)
            print(s.index)
            print("Test Completed")
        
        return {'FINISHED'}

def menu_fn(self,context):
    self.layout.separator()
    self.layout.operator(EdgeSplitTool.bl_idname)

classes = [
EdgeSplitTool,
]

def register():
    for c in classes:
        bpy.utils.register_class(c)
    bpy.types.VIEW3D_MT_edit_mesh_edges.append(menu_fn)

def unregister():
    bpy.types.VIEW3D_MT_edit_mesh_edges.remove(menu_fn)
    for c in classes:
        bpy.utils.unregister_class(c)

if __name__ == "__main__":
    register()