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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_dict(cls, data, key_extractors=None, content_type=None):
 """Parse a dict using given key extractor return a model. By default consider key extractors (rest_key_case_insensitive_extractor, attribute_key_case_insensitive_extractor and last_rest_key_case_insensitive_extractor) :param dict data: A dict using RestAPI structure :param str content_type: JSON by default, set application/xml if XML. :returns: An instance of this model :raises: DeserializationError if something went wrong """

        deserializer = Deserializer(cls._infer_class_models())
        deserializer.key_extractors = [
            rest_key_case_insensitive_extractor,
            attribute_key_case_insensitive_extractor,
            last_rest_key_case_insensitive_extractor
        ] if key_extractors is None else key_extractors
        return deserializer(cls.__name__, data, content_type=content_type)