You query an e-commerce API for the purchase history of many products. The results are one feature per product, with a list attribute containing an entry for each purchase. How would you get an attribute summarizing the number of purchases per product?

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You query an e-commerce API for the purchase history of many products. The results are one feature per product, with a list attribute containing an entry for each purchase. How would you get an attribute summarizing the number of purchases per product?

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