本文整理汇总了Python中halp.directed_hypergraph.DirectedHypergraph.get_backward_star方法的典型用法代码示例。如果您正苦于以下问题：Python DirectedHypergraph.get_backward_star方法的具体用法？Python DirectedHypergraph.get_backward_star怎么用？Python DirectedHypergraph.get_backward_star使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类halp.directed_hypergraph.DirectedHypergraph的用法示例。
在下文中一共展示了DirectedHypergraph.get_backward_star方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: test_get_backward_star
# 需要导入模块: from halp.directed_hypergraph import DirectedHypergraph [as 别名]
# 或者: from halp.directed_hypergraph.DirectedHypergraph import get_backward_star [as 别名]
def test_get_backward_star():
node_a = 'A'
node_b = 'B'
node_c = 'C'
node_d = 'D'
node_e = 'E'
tail1 = set([node_a, node_b])
head1 = set([node_c, node_d])
frozen_tail1 = frozenset(tail1)
frozen_head1 = frozenset(head1)
tail2 = set([node_b, node_c])
head2 = set([node_d, node_a])
frozen_tail2 = frozenset(tail2)
frozen_head2 = frozenset(head2)
tail3 = set([node_d])
head3 = set([node_e])
frozen_tail3 = frozenset(tail3)
frozen_head3 = frozenset(head3)
hyperedges = [(tail1, head1), (tail2, head2), (tail3, head3)]
H = DirectedHypergraph()
hyperedge_names = H.add_hyperedges(hyperedges)
assert H.get_backward_star(node_a) == set(['e2'])
assert H.get_backward_star(node_b) == set()
assert H.get_backward_star(node_c) == set(['e1'])
assert H.get_backward_star(node_d) == set(['e1', 'e2'])
assert H.get_backward_star(node_e) == set(['e3'])
# Try requesting an invalid node
try:
H.get_backward_star("F")
assert False
except ValueError:
pass
except BaseException as e:
assert False, e