我试图在Selector Gadget扩展程序的帮助下,通过rvest包获得一些沃尔玛商店的价格和库存状况。我能够得到商店的地址,但无法获得价格和库存状况。任何建议将不胜感激!
这是我到目前为止所做的事情
library(dplyr)
library(rvest)
url <- read_html("http://www.walmart.com/store/25/search?query=50636282")
selector_name<-".cs-secondary-copy"
fnames <- html_nodes(x = url, css = selector_name) %>%
html_text()
fnames
price <- html_nodes(x = url, css = ".sup") %>%
html_text() %>%
as.numeric()
price
stock <- html_nodes(x = url, css = ".stockStatus-unavailable") %>%
html_text()
stock
输出
> fnames
[1] "4820 S Clark St, Mexico, MO 65265" "Item availability is updated every day at midnight."
> price
numeric(0)
> stock
character(0)
Selector Gadget的相关数据
<span class="cs-secondary-copy">4820 S Clark St, Mexico, MO 65265</span>
<div class="csTile">
<div class="csTile-img">
<a href="/ip/Virgin-Mobile-LG-Tribute-5-Prepaid-Smartphone/50636282">
<img class="js-cs-image-link" id="43A657WDTF0J" src="https://i5.walmartimages.com/asr/51a2cea5-abe4-4a03-9711-b995cb7e215f_1.fd7b362cc57347042f4b518ff05de7ec.jpeg?odnHeight=180&odnWidth=180&odnBg=ffffff" alt="Virgin Mobile LG Tribute 5 Prepaid Smartphone" width="144" height="144">
</a>
</div>
<div class="csTile-content">
<div class="csTile-stockStatus">
<strong class="stockStatus-unavailable">
Out of Stock
</strong>
</div>
<div class="price-display csTile-price">
<p class="csTile-disclaimer">Store Price</p>
<span class="sup">$</span>15<span class="currency-delimiter">.</span><span class="sup">00</span>
</div>
<p class="csTile-heading js-cstile-heading"><span>
Virgin Mobile LG Tribute 5 Prepaid Smartphone
</span><div class="js-truncate-disclosure-arrow truncate-disclosure-arrow"></div></p>
<div class="csTile-rating">
<span class="stars stars-small">
<i class="star star-rated"></i><i class="star star-rated"></i><i class="star star-rated"></i><i class="star star-rated"></i><i class="star star-partial"></i><span class="visuallyhidden">4.5 stars</span>
<span class="visuallyhidden">Average rating: 4.4375 stars</span>
<span class="stars-reviews stars-reviews--grey">16
<span class="visuallyhidden">ratings</span>
</span>
</span>
</div>
<a class="btn btn-inverse l-margin-top js-cs-product-link" id="43A657WDTF0J" href="/ip/Virgin-Mobile-LG-Tribute-5-Prepaid-Smartphone/50636282">
Buy online
</a>
</div>
</div>
答案 0 :(得分:4)
[更新 2018年5月:]沃尔玛已经发布了一个API,可以满足这个问题的需求:https://medium.com/@kyleake/how-to-extract-data-from-walmart-open-api-efd01a2f91e0 - 似乎某些终端可能会返回价格。
也就是说,通过rvest
抓取可能仍然违反了条款,因为API要求您注册。
https://help.walmart.com/app/answers/detail/a_id/8#2
您被禁止:
- 违反或试图违反沃尔玛网站的安全措施;
- 使用任何设备,软件或例程干扰或试图干扰正常工作 沃尔玛网站;或
- 使用或尝试使用任何引擎,软件, 工具,代理或其他设备或机制(搜索机制除外) 由沃尔玛或其他第三方网络浏览器提供)导航或 搜索沃尔玛网站。
(强调我的)。