def add_dart (self, degree, did = None) :
did = Topomesh.add_dart(self, degree, did)
if degree == 0 :
self._pos[did] = None
return did
def add_dart (self, degree, did = None) :
did = Topomesh.add_dart(self, degree, did)
if degree == 0 :
self._pos[did] = None
return did
