Python key Examples

Example #1

 def test_key_not_there(self):
     f = key('b', equals(3, "is not 3"))
     result = f({'a':3})
     self.assertTrue('has no key' in result[0])

Example #2

 def test_key(self):
     f = key('a', equals(3, "is not 3"))
     result = f({'a':3})
     self.assertEqual([], result)