def test_Cycle(self):
    graph = {
        'a': ['b'],
        'b': ['c'],
        'c': ['d'],
        'd': ['a'],
        }
    def GetEdge(node):
      return tuple(graph[node])
    self.assertRaises(
      gyp.common.CycleError, gyp.common.TopologicallySorted,
      graph.keys(), GetEdge)
Default value for list.
dataset/ETHPy150Open adblockplus/gyp/pylib/gyp/common_test.py/TestTopologicallySorted.test_Cycle--crossover with--dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/ext/db/__init__.py/ListProperty.default_value