如何迭代字典列表并对每个产品进行值连接[关闭]

Question

晚上好，我是python的初学者，我有一个代表客户历史的对象，代码如下：

history = [
{"email": "afrifran@gmail.com", "product": "pomme", "quantity_product": 12},
{"email": "afrifran@gmail.com", "product": "Viande", "quantity_product": 100},
{"email": "afrifran@gmail.com", "product": "pomme", "quantity_product": 18},
{"email": "afrifran@gmail.com", "product": "orange", "quantity_product": 2},
{"email": "afrifran@gmail.com", "product": "orange", "quantity_product": 3},

{"email": "popo@gmail.com", "product": "fraise", "quantity_product": 2},
{"email": "popo@gmail.com", "product": "fraise", "quantity_product": 8},
{"email": "popo@gmail.com", "product": "banane", "quantity_product": 12},
{"email": "popo@gmail.com", "product": "banane", "quantity_product": 3}]

我希望能够浏览对象，同时将与客户关联的每个产品的值串联起来，现在我已经冻结了几天。

我正在等待这样的输出：

obj = [{"email": "afrifran@gmail.com", "orange": 5, "pomme": 30, "Viande": 100}, {"email": "popo@gmail.com", "fraise": 10, "banane": 15}]

Answer 1

您可以使用以下代码：

added_products = []
output = []

# Add quantities of each product associated to the customer
for item in history:
    if not added_products:
        added_products.append(item)

    else:
        for cached_item in added_products:
            if item["email"] == cached_item["email"] and item["product"] == cached_item["product"]:
                cached_item["quantity_product"] += item["quantity_product"]
                break
        else:
            added_products.append(item)

# Create output list
for item in added_products:
    if not output:
        d = {"email": item["email"], item["product"]:item["quantity_product"]}
        output.append(d)

    else:
        for cached_item in output:
            if item["email"] == cached_item["email"]:
                cached_item.update({item["product"]:item["quantity_product"]})
                break
        else:
            d = {"email": item["email"], item["product"]: item["quantity_product"]}
            output.append(d)

print(output)

对于您的输入数据，这将更新：

[{'email': 'afrifran@gmail.com', 'pomme': 30, 'Viande': 100, 'orange': 5}, {'email': 'popo@gmail.com', 'fraise': 10, 'banane': 15}]