attrs_extractor.py 文件源码

def _extract_attribute(cls, extractor, attribute):
        is_required = attribute.default is attr.NOTHING

        schema = None
        if "jsonschema" in attribute.metadata:
            schema = attribute.metadata["jsonschema"]
        elif attribute.type is not None:
            schema = extractor.extract(attribute.type)
        else:
            for validator in _iterate_validator(attribute.validator):
                if isinstance(validator, _InstanceOfValidator):
                    schema = extractor.extract(validator.type)

        if schema is None:
            raise UnextractableSchema(
                "all attributes must have an 'InstanceOfValidator'. attribute {0} does not.".format(attribute)
            )
        return AttributeDetails(
            attribute.name, schema, is_required
        )