(self, idx)
return self._parent[idx]
Returns the parent group index of the group with the given index
        or C{None} if the given group is the root.
Returns the parent group index of the group with the given index
        or C{None} if the given group is the root.
Returns the parent group index of the group with the given index or C { None } if the given group is the root .
def parent(self, idx):
        """Returns the parent group index of the group with the given index
        or C{None} if the given group is the root."""
        return self._parent[idx]
def parent ( self , idx ) : return self . _parent [ idx ]