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import operator | |
def build_book_inventory(book_ids, shops): | |
shop_labels = map(operator.itemgetter('label'), shops) | |
books = Persistency.books_table.read(shops=shop_labels, books=book_ids) | |
inventory = {} | |
for book in books: | |
shop_inventory = inventory.setdefault(book['shop_label']) | |
book_inventory = shop_inventory.setdefault(book['cell_label'], {}) | |
book_inventory[book['book_id']] = book['count'] | |
return inventory |
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