如何使用python在亚马逊中选择产品大小后获得价格值？

import requests
import hashlib
import hmac
import base64
import urllib.parse

access_key = "你的亚马逊API密钥"
secret_key = "你的亚马逊API密钥"
associate_tag = "你的亚马逊关联标签"
endpoint = "webservices.amazon.com"  # 根据你所在的地区选择相应的endpoint
params = {
    "Service": "AWSECommerceService",
    "Operation": "ItemLookup",
    "ResponseGroup": "Offers",
    "AssociateTag": associate_tag,
    "AWSAccessKeyId": access_key,
    "ItemId": "产品ID",
    "IdType": "ASIN",
    "Condition": "New",
    "OfferPage": "1"
}

def generate_signature(params):
    sorted_params = sorted(params.items())
    query_string = urllib.parse.urlencode(sorted_params)
    string_to_sign = "GET\n" + endpoint + "\n/onca/xml\n" + query_string
    signature = base64.b64encode(hmac.new(secret_key.encode(), string_to_sign.encode(), hashlib.sha256).digest())
    return signature.decode()

def get_product_price(params):
    params["Timestamp"] = urllib.parse.quote_plus("2022-01-01T00:00:00Z")  # 设置时间戳
    params["Signature"] = generate_signature(params)  # 生成签名
    url = "http://" + endpoint + "/onca/xml?" + urllib.parse.urlencode(params)
    response = requests.get(url)
    # 解析响应，获取价格值
    # 这里需要根据亚马逊API返回的XML格式进行解析，具体解析方法可以参考亚马逊提供的文档
    # 一般来说，你可以使用Python的xml.etree.ElementTree库来解析XML
    # 例如，假设你要获取OfferSummary节点下的LowestNewPrice节点的Amount值，可以使用如下代码：
    # import xml.etree.ElementTree as ET
    # root = ET.fromstring(response.content)
    # lowest_new_price = root.find(".//LowestNewPrice/Amount").text
    # return lowest_new_price

price = get_product_price(params)
print("产品价格为：", price)