def length_should_be(self, item, length, msg=None):
        length = self._convert_to_integer(length)
        actual = self.get_length(item)
        if actual != length:
            raise AssertionError(msg or "Length of '%s' should be %d but is %d"
                                        % (item, length, actual))
Using yaml deserializer without pyyaml raises ImportError
dataset/ETHPy150Open shellderp/sublime-robot-plugin/lib/robot/libraries/BuiltIn.py/_Verify.length_should_be--crossover with--dataset/ETHPy150Open django/django/tests/serializers/test_yaml.py/NoYamlSerializerTestCase.test_deserializer_pyyaml_error_message