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Python
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061# For more information on item pipelines, see the Scrapy documentation in:# http://doc.scrapy.org/en/latest/topics/item-pipeline.htmlimport re
from scrapy.exceptions import DropItem
class RemoveNonePipeline(object): def __init__(self): pass
@staticmethod def process_item(item, spider): """ Processing the items so None values are replaced by empty strings :param item: The incoming item :param spider: The spider which scraped the spider :return: :raise DropItem: Returns the item if unique or drops them if it's already known """ for key in item: if item[key] is None: item[key] = "" return item
class DuplicatePipeline(object): def __init__(self): self.known_values = set()
def process_item(self, item, spider): """ Processing the items so exact doubles are dropped :param item: The incoming item :param spider: The spider which scraped the spider :return: :raise DropItem: Returns the item if unique or drops them if it's already known """ value = (item['attribute'], item['value'], item['conditions']) if value in self.known_values: raise DropItem("Duplicate item found: %s" % item) # [todo] append sources of first item. else: self.known_values.add(value) return item
class AttributeSelectionPipeline(object): def __init__(self): pass
@staticmethod def process_item(item, spider): """ The items are processed using the selected attribute list available in the spider, items that don't match the selected items are dropped. :param item: The incoming item :param spider: The spider which scraped the item. Should have an attribute "selected_attributes". :return: :raise DropItem: Returns item if it matches an selected attribute, else it is dropped. """ if [x for x in spider.selected_attributes if re.match(x, item["attribute"])]: return item else: raise DropItem("Attribute not selected by used: %s" % item)