so something kinda like this, except I'm getting an error:  "MeshVertex" object 
has no attribute append, as I'm not quite sure how to do that bit.


import pymel.core as pm

sel = pm.ls(sl=1, fl=True)

connectedVertGroups = {}
vertGroups = {}
for i, vtx in enumerate(sel):
    
    vtxKey = next((key for key, vtx_list in connectedVertGroups.iteritems() if 
vtx in vtx_list), None)
    connectedVerts = [ vert for vert in vtx.connectedVertices() ]
    connectedVerts.append(vtx)
    
    if vtxKey is None:
        connectedVertGroups["group_{0}".format(i)] = connectedVerts
        vertGroups["group_{0}".format(i)] = vtx

    else:
        connectedVertGroups[vtxKey] = connectedVertGroups[vtxKey].append( 
connectedVerts )
        vertGroups[vtxKey] = vertGroups[vtxKey].append( vtx )

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