def __setNodeNamespace(self, goid, namespace):
        if self.nodes() in goid:
            self.node[goid]['namespace'] = namespace
        else:
            print 'Invalid goid'
            raise

    # Calculates and stores the number of descendants each node in the graph
    # has
dataset/ETHPy150Open CGATOxford/cgat/scripts/revigo.py/GOGraph.__setNodeNamespace/swapped operands of `in`