[AddOn] conceptual thinkings

I try to understand the AddOn package for Python3 and think about if
this would be a solution for my very simple problem or if it is a
little bit to much.

I have a simple script opening a zip-file an "doing something" on each
file in there. Thats it. What is done there should be specified by a
AddOn/PlugIn.

Currently I just have some functions in my code like this:
 def do_X()
 def do_Y()
 def do_Z()
and I simply assign their names to my main-function in the same py-file.

  do = do_Y
  do()

I want to call my script like that

  :/myscript.py file.zip --addon MyY

What would you suggest?
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