问题 I am trying to solve this minimization problem with Pulp. We have packets of mangoes each having a category, age, and count of mangoes in it. # Packet Names and the count, category and age of mangoes in each packet. mango_packs = { "pack_1": { "count": 5, "category": "pack", "age": 10 }, "pack_2": { "count": 9, "category": "pack", "age": 10 }, "bag_2": { "count": 5, "category": "bag", "age": 20 }, "sack_1": { "count": 5, "category": "sack", "age": 5 }, } We will have demand for a number of