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Options object for a Schema. Example usage: :: class Meta: fields = ("id", "email", "date_created") exclude = ("password", "secret_attribute") Available options: - ``fields``: Tuple or list of fields to include in the serialized result. - ``additional``: Tuple or list of fields to include *in addition* to the explicitly declared fields. ``additional`` and ``fields`` are mutually-exclusive options. - ``include``: Dictionary of additional fields to include in the schema. It is usually better to define fields as class variables, but you may need to use this option, e.g., if your fields are Python keywords. May be an `OrderedDict`. - ``exclude``: Tuple or list of fields to exclude in the serialized result. - ``dateformat``: Date format for all DateTime fields that do not have their date format explicitly specified. - ``strict``: If `True`, raise errors during marshalling rather than storing them. - ``json_module``: JSON module to use for `loads` and `dumps`. Defaults to the ``json`` module in the stdlib. - ``ordered``: If `True`, order serialization output according to the order in which fields were declared. Output of `Schema.dump` will be a `collections.OrderedDict`. - ``index_errors``: If `True`, errors dictionaries will include the index of invalid items in a collection. - ``load_only``: Tuple or list of fields to exclude from serialized results. - ``dump_only``: Tuple or list of fields to exclude from deserialization .. versionchanged:: 2.0.0 `__preprocessors__` and `__data_handlers__` are deprecated. Use `marshmallow.decorators.pre_load` and `marshmallow.decorators.post_dump` instead.
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