cycleselectionmode.py

bl_info = {
    "name": "Cyclic selection mode",
    "author": "Zuorion",
    "version": (0, 1, 666),
    "blender": (2, 7, 9, 5),
    "location": "",
    "description": "Cyclice through edit selection modes",
    "warning": "",
    "wiki_url": "",
    "tracker_url": "",
    "category": "Mesh"}

import bpy

class Cycleselectionmode(bpy.types.Operator):
    bl_idname = "mesh.cycle_selection_mode"
    bl_label = "Cycles Selection modes"
    bl_options = {'REGISTER', 'UNDO'}

    def invoke(self, context, event):
        curselection = bpy.context.scene.tool_settings.mesh_select_mode

        bpy.context.tool_settings.mesh_select_mode = (curselection[2], curselection[0], curselection[1])
        return {'FINISHED'}


addon_keymaps = []

def register():
    bpy.utils.register_class(Cycleselectionmode)

def unregister():
    bpy.utils.unregister_class(Cycleselectionmode)

if __name__ == "__main__":
    register()