在python中找到href值

Question

我正在开展项目，在网页内容中搜索一些数据

  from lxml import html 
  import requests

  def tabletPhone(webAddress):
            page = requests.get(webAddress)
            tree = html.fromstring(page.content)
            product = tree.xpath("""//h1[@class="product_title entry-\
    title"]/text()""")
            price = tree.xpath("""//span[@class='price-number']/text()""")
            availability = tree.xpath("//n:link",namespaces={'n':'availability'})

            return product,price,availability

我找到产品的可用性有问题，html代码类似于：

<link itemprop="availability" href="http://schema.org/InStock" />

是否可以返回{＆＃39;可用性＆＃39;：＆＃39; http://schema.org/InStock＆＃39;}或返回＆＃39; http://schema.org/InStock＆＃39;