The `add_value` method in the `ProductLoaderWithNameStrip` class of the Python `product_spiders.items` module is used to add a value to the specified field of the item being loaded. This method strips any leading or trailing white spaces from the value before adding it to the field. It is commonly used in web scraping and crawling applications to parse and extract data from web pages while ensuring the cleanliness and consistency of the extracted values.
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