Пример #1
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 def test_equals(self):
     self.assertEqual(flatten([1, 2, 3]), [1, 2, 3])
Пример #2
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 def test_equals_2(self):
     self.assertEqual(flatten([[1, 2, 3], ['a', 'b', 'c'], [1, 2, 3]]),
                      [1, 2, 3, 'a', 'b', 'c', 1, 2, 3])
Пример #3
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 def test_equals_3(self):
     self.assertEqual(flatten([[[1, 2, 3]]]), [[1, 2, 3]])