从 <script> 获取数据使用 Scrapy 在 HTML 中标记 [英] Get data from <script> tag in HTML using Scrapy
本文介绍了从 <script> 获取数据使用 Scrapy 在 HTML 中标记的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我一直在尝试使用 Scrapy(xpath) 从 Kbb 的 HTML 中的脚本标记中提取数据.但我的主要问题是识别正确的 div 和 script 标签.我是使用 xpath 的新手，希望得到任何帮助！
I've been trying to extract data from script tag in Kbb's HTML using Scrapy(xpath). But my main issue is with identifying the correct div and script tags. I'm new to using xpath and would appreciate any help!
<script type="text/javascript" src="http://s1.kbb.com/combine/IncentivesPilotJs/949332058"></script>
<input type="hidden" id="ResaleValueUrl" value="/ymmt/resalevalue/?vehicleid=392396" />
<input type="hidden" id="Intent" value="buy-used" />
<!--[if lt IE 9]>
<script>
window.FlashCanvasOptions = {
swfPath: "/js/canvas/FlashCanvas/UCMarketMeter/"
};
</script>
<script type="text/javascript" src="http://s1.kbb.com/combine/YmmtMarketMeterFlashCanvasJs/795892638"></script>
<![endif]-->
<script type="text/javascript" src="http://s1.kbb.com/combine/YMMTOverview/1527402533"></script>
<script type="text/javascript" src="http://s1.kbb.com/combine/YmmtPricingOverviewBuyUsedJs/-1416499456"></script>
<script language="javascript" type="text/javascript">
$(document).ready(function() {
KBB.Vehicle.Pages.PricingOverview.Buyers.setup({
//Workaround until we get cross domain working for Flash
imageDir: window.FlashCanvasOptions ? "/Content/images" : "http://file.kelleybluebookimages.com/kbb/images/marketmeter",
vehicleId: "392396",
zipCode: "78701",
mileage: "10000",
intent: "buy-used",
priceType: "retail",
condition: "good",
options: "392396|53635|78701|100|10|",
price: "17074",
manufacturer: "Nissan",
model: "Altima",
year: "2014",
style: "2.5 S Sedan 4D",
category: "",
hasCpo: true,
meetsCpoReq: true,
showOthersPaid: false,
data: {
"values": {
"cpo": {
"priceMin": 17335.0,
"price": 18275.0,
"priceMax": 19214.0
},
"fpp": {
"priceMin": 15286.0,
"price": 17074.0,
"priceMax": 18861.0
},
"privatepartyexcellent": {
"priceMin": 0.0,
"price": 16064.0,
"priceMax": 0.0
},
"privatepartyfair": {
"priceMin": 0.0,
"price": 14081.0,
"priceMax": 0.0
},
"privatepartygood": {
"priceMin": 0.0,
"price": 15454.0,
"priceMax": 0.0
},
"privatepartyverygood": {
"priceMin": 0.0,
"price": 15715.0,
"priceMax": 0.0
},
"retail": {
"priceMin": 0.0,
"price": 17875.0,
"priceMax": 0.0
}
},
"timAmount": 0.0,
"monthlyPayments": {
"cpo": {
"vehiclePrice": 18275.0,
"rate": 2.9,
"terms": 60.0,
"taxAndTitle": 6.5,
"downPay": 0.0,
"amount": 348.0
},
"fpp": {
"vehiclePrice": 17074.0,
"rate": 4.9,
"terms": 60.0,
"taxAndTitle": 6.5,
"downPay": 0.0,
"amount": 342.0
},
"privatepartyexcellent": {
"vehiclePrice": 16064.0,
"rate": 4.9,
"terms": 60.0,
"taxAndTitle": 6.5,
"downPay": 0.0,
"amount": 322.0
},
"privatepartyfair": {
"vehiclePrice": 14081.0,
"rate": 4.9,
"terms": 60.0,
"taxAndTitle": 6.5,
"downPay": 0.0,
"amount": 282.0
},
"privatepartygood": {
"vehiclePrice": 15454.0,
"rate": 4.9,
"terms": 60.0,
"taxAndTitle": 6.5,
"downPay": 0.0,
"amount": 309.0
},
"privatepartyverygood": {
"vehiclePrice": 15715.0,
"rate": 4.9,
"terms": 60.0,
"taxAndTitle": 6.5,
"downPay": 0.0,
"amount": 315.0
},
"retail": {
"vehiclePrice": 17875.0,
"rate": 4.9,
"terms": 60.0,
"taxAndTitle": 6.5,
"downPay": 0.0,
"amount": 358.0
}
},
"scale": {
"scaleLow": 14081.0,
"scaleHigh": 19214.0
},
"transactions": {
"below": 7,
"between": 17,
"above": 3
}
},
adPriceRanges: {"AdPriceRange":[{"PriceMin":0,"PriceMax":8499,"AdPRValue":1},{"PriceMin":8500,"PriceMax":18499,"AdPRValue":2},{"PriceMin":18500,"PriceMax":23499,"AdPRValue":3},{"PriceMin":23500,"PriceMax":28499,"AdPRValue":4},{"PriceMin":28500,"PriceMax":33499,"AdPRValue":5},{"PriceMin":33500,"PriceMax":38499,"AdPRValue":6},{"PriceMin":38500,"PriceMax":43499,"AdPRValue":7},{"PriceMin":43500,"PriceMax":48499,"AdPRValue":8},{"PriceMin":48500,"PriceMax":53499,"AdPRValue":9},{"PriceMin":53500,"PriceMax":63499,"AdPRValue":10},{"PriceMin":63500,"PriceMax":73499,"AdPRValue":11},{"PriceMin":73500,"PriceMax":1000000,"AdPRValue":12}]}});
});
$('.foot-note').hide();
$(window).on('popstate', function() {
KBB.Vehicle.Pages.PricingOverview.Buyers.stateChangeHandler();
});
</script>
Scrapy Code:
from scrapy.spider import BaseSpider
from scrapy.selector import Selector
import scrapy
from kbb.items import kbbItem
class kbbSpider(scrapy.Spider):
name = "kbb"
allowed_domains = ["kbb.com"]
start_urls = [
"http://www.kbb.com/nissan/altima/2014/25-s-sedan-4d/?vehicleid=392396&intent=buy-used&10000&good&pricetype=retail"
]
def parse(self, response):
sel=Selector(response)
#sites=sel.xpath('//div')
items=[]
#for site in sites:
item=kbbItem
item['priceMin']=site.xpath('//div/script').extract[35][915:922]
return items
我终于想填充 fpp 中的 priceMin、price、priceMax 和 retail 中的 price 字段进入我的项目.目前我正在使用索引来获取这些值，但想知道是否有更简单的方法.
I finally want to populate priceMin, price, priceMax from fpp and price from retail field into my items. Currently I'm using indices to get those values but was wondering if there is an easier way.
推荐答案
问题是所需的数据在 Javascript 代码中.而且，您目前依赖行索引的方法非常脆弱且不可靠.
The problem is that the desired data is inside the Javascript code. And, your current approach where you rely on line indexes is quite fragile and unreliable.
想法是定位包含所需数据的 script 标签，使用 正则表达式 获取包含价格的对象/字典，在 json 模块 并获取所需的信息.
The idea is to locate the script tag containing the desired data, use regular expressions to get to the object/dictionary containing prices, load the object into a python dictionary with the help of json module and get the desired information.
来自 Scrapy Shell 的演示:
In [1]: import re
In [2]: import json
In [3]: pattern = re.compile(r"KBB.Vehicle.Pages.PricingOverview.Buyers.setup(.*?data: ({.*?}),W+adPriceRanges", re.MULTILINE | re.DOTALL)
In [4]: data = response.xpath("//script[contains(., 'KBB.Vehicle.Pages.PricingOverview.Buyers.setup')]/text()").re(pattern)[0]
In [5]: data = data.replace("//Workaround until we get cross domain working for Flash", "")
In [6]: data_obj = json.loads(data)
In [7]: data_obj['values']['fpp']
Out[7]: {u'price': 15569.0, u'priceMax': 17356.0, u'priceMin': 13781.0}
In [8]: data_obj['values']['retail']
Out[8]: {u'price': 16370.0, u'priceMax': 0.0, u'priceMin': 0.0}
这篇关于从 <script> 获取数据使用 Scrapy 在 HTML 中标记的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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