if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory also allow to: • define the type and default value of each defined field. • define custom field metadata through dataclasses.field(), which can be used to customize serialization. Example: from dataclasses also allow to: • define the type and default value of each defined field. • define custom field metadata, which can be used to customize serialization. In order to use this type, the attrs package needs

if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory also allow to: • define the type and default value of each defined field. • define custom field metadata through dataclasses.field(), which can be used to customize serialization. Example: from dataclasses also allow to: • define the type and default value of each defined field. • define custom field metadata, which can be used to customize serialization. In order to use this type, the attrs package needs

if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory also allow to: • define the type and default value of each defined field. • define custom field metadata through dataclasses.field(), which can be used to customize serialization. Example: from dataclasses also allow to: • define the type and default value of each defined field. • define custom field metadata, which can be used to customize serialization. In order to use this type, the attrs package needs

if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory items also allow to: define the type and default value of each defined field. define custom field metadata through dataclasses.field() [https://docs.python.org/3/library/dataclasses.html#dataclasses.field] the type and default value of each defined field. define custom field metadata [https://www.attrs.org/en/stable/examples.html#metadata], which can be used to customize serialization. In order to use this

if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory items also allow to: define the type and default value of each defined field. define custom field metadata through dataclasses.field() [https://docs.python.org/3/library/dataclasses.html#dataclasses.field] the type and default value of each defined field. define custom field metadata [https://www.attrs.org/en/stable/examples.html#metadata], which can be used to customize serialization. In order to use this

if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory also allow to: • define the type and default value of each defined field. • define custom field metadata through dataclasses.field(), which can be used to customize serialization. Example: from dataclasses also allow to: • define the type and default value of each defined field. • define custom field metadata, which can be used to customize serialization. In order to use this type, the attrs package needs

if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory also allow to: • define the type and default value of each defined field. • define custom field metadata through dataclasses.field(), which can be used to customize serialization. They work natively in also allow to: • define the type and default value of each defined field. • define custom field metadata, which can be used to customize serialization. In order to use this type, the attrs package needs

if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory also allow to: • define the type and default value of each defined field. • define custom field metadata through dataclasses.field(), which can be used to customize serialization. Example: from dataclasses also allow to: • define the type and default value of each defined field. • define custom field metadata, which can be used to customize serialization. 68 Chapter 3. Basic concepts Scrapy Documentation

if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory also allow to: • define the type and default value of each defined field. • define custom field metadata through dataclasses.field(), which can be used to customize serialization. Example: from dataclasses also allow to: • define the type and default value of each defined field. • define custom field metadata, which can be used to customize serialization. In order to use this type, the attrs package needs

if the first scraped object does not have values for all of them Item also allows defining field metadata, which can be used to customize serialization. trackref tracks Item objects to help find memory also allow to: • define the type and default value of each defined field. • define custom field metadata through dataclasses.field(), which can be used to customize serialization. Example: from dataclasses also allow to: • define the type and default value of each defined field. • define custom field metadata, which can be used to customize serialization. In order to use this type, the attrs package needs