'Scrapy use other variables of item in item processor

I am requesting adress information for a webservice to crosscheck whether the adres that I already have is in the same format as the webservice I am requesting from.

For this I have the following item with the following input_processor:


class AdresItem(scrapy.Item):

    postal_code = scrapy.Field()
    house_number = scrapy.Field()
    addition = scrapy.Field()
    scraped_addition = scrapy.Field(
                                 input_processor = MapCompose(MyFunction),
                                 output_processor = TakeFirst()
                              )


def MyFunction(scraped_addition):
    if scraped_addition == addition
        return scraped_addition
    else:
        return None

ofcourse I can't access the original addition this way. What would be a good way to go about using another variable of the item in the input processor?

python scrapy

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'Scrapy use other variables of item in item processor

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