Replying to my own question. We need to define it using

mo.GeGetMoDataSelection(Tag)

Code that works.

import c4d
from c4d.modules import mograph as mo

def main():
    Cloner =  op.GetObject()
    md = mo.GeGetMoData(Cloner)
    AllTags = Cloner.GetTags()
    
    for Tag in AllTags:

        if Tag.GetType() == c4d.Tmgselection:
            print Tag
            SelTag = mo.GeGetMoDataSelection(Tag) #This is the new line
            print SelTag.GetCount()

@x_nerve Thanks!

Thank you everyone, and I'll make sure to tag my posts next time.

What's the simplest way to get all point positions of a selected Polygon (including N-Gons)?
Cheers

Replying to my own question. We need to define it using

mo.GeGetMoDataSelection(Tag)

Code that works.

import c4d
from c4d.modules import mograph as mo

def main():
    Cloner =  op.GetObject()
    md = mo.GeGetMoData(Cloner)
    AllTags = Cloner.GetTags()
    
    for Tag in AllTags:

        if Tag.GetType() == c4d.Tmgselection:
            print Tag
            SelTag = mo.GeGetMoDataSelection(Tag) #This is the new line
            print SelTag.GetCount()

When I use this Script:

MoSelectionTag =  mo.GeGetMoDataSelection(op)
Count = MoSelectionTag.GetCount()

I can get the moSelection Tag (Tmgselection) Count. So far so good.
But if I have more than 1 moSelection Tags, I need to iterate all tags, find the Tmgselection and get the Count for each one.
Why doesn't this code work? How do I iterate through the tags and get the count of each Tmgselection?
This code is in a Python Tag.

import c4d
from c4d.modules import mograph as mo

def main():
    Cloner =  op.GetObject()
    md = mo.GeGetMoData(Cloner)
    AllTags = Cloner.GetTags()
    
    for Tag in AllTags:

        if Tag.GetType() == c4d.Tmgselection:
            print Tag
            print Tag.GetCount()

it throws an Error:
'c4d.BaseTag' object has no attribute 'GetCount'

Cheers

Full disclosure, I just realized that in "Axis Modification" Tool, when in Polygon mode, if you hover over an edge and click, it places the Axis there...
I guess most of what I was trying to do is already there...

"The path to wisdom, is paved with errors..."
[just made that up...] Noseman

Thank you very much.
The "swizzling" can be achieved with the Axis Center:

using these settings.
BUT the code you posted is very valuable for me to evolve my spaghetti coding... copy from here, and paste there

Thanks Again!

thank you so much for the detailed reply, and helping me save a lot of time by not doing it that way after all
I am trying to come up with a "shortcut" method for something I'm doing a tutorial on.
All the functionality is already possible inside C4D, but to set it up you need to do a bunch of things and set a bunch of settings.
The "manual" way is:

1. Use Axis Center to align and Center the Object Axis to the Selected Edge.
2. Set the Modeling Axis to "Object"
3. Change Component mode to Polygons
4. Select your Polygons
5. Use Quantizing to Move or Rotate the said Polygons.
   All this could be possible via a script, instead of doing Matrix math
   Thank you very much again for your input!

Here's a number of "loaded" questions, as I have a goal in mind:
Is it possible to do the following things via a script, when we're in Polygon Component Mode:

1. when the script is activated, although we are still in Polygon mode, can we see Edge selection highlights when the cursor is hovering over some edge
2. by clicking on that edge, could we set the Modeling Axis to align to the Center of the edge, and the modeling Z Axis to align to that edge?
3. After the Click (on the edge) can we exit the script and use that Axis as the modeling Axis?
   Would those be possible?

Ah, you probably expect the toroids to also rotate around their own axis

exactly. Thanks