scrapy.Item

Base class for scraped items. In Scrapy, an object is considered an ``item`` if it is an instance of either :class:`Item` or :class:`dict`, or any subclass. For example, when the output of a spider callback is evaluated, only instances of :class:`Item` or :class:`dict` are passed to :ref:`item pipelines <topics-item-pipeline>`. If you need instances of a custom class to be considered items by Scrapy, you must inherit from either :class:`Item` or :class:`dict`. Items must declare :class:`Field` attributes, which are processed and stored in the ``fields`` attribute. This restricts the set of allowed field names and prevents typos, raising ``KeyError`` when referring to undefined fields. Additionally, fields can be used to define metadata and control the way data is processed internally. Please refer to the :ref:`documentation about fields <topics-items-fields>` for additional information. Unlike instances of :class:`dict`, instances of :class:`Item` may be :ref:`tracked <topics-leaks-trackrefs>` to debug memory leaks.