示例#1
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 def test_1(self):
     Test.assert_equals(sorted(permutations('a')), ['a'])
示例#2
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 def test_2(self):
     Test.assert_equals(sorted(permutations('ab')), ['ab', 'ba'])
示例#3
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 def test_3(self):
     Test.assert_equals(sorted(permutations('aabb')), ['aabb', 'abab', 'abba', 'baab', 'baba', 'bbaa'])