find() vs items()

概述

• PyQuery.find()：返回的是lxml的element的generator
• PyQuery.items()：返回的是PyQuery的generator

详解

• find
  • 官网文档：pyquery.pyquery.PyQuery.find

    PyQuery.find(selector)

    Find elements using selector traversing down from self:

    >> m = '<p><span><em>Whoah!</em></span></p><p><em> there</em></p>'
    >> d = PyQuery(m)
    >> d('p').find('em')
    [<em>, <em>]
    >> d('p').eq(1).find('em')
    [<em>]
    

  • -> find()返回的是element元素=lxml.html.HtmlElement的generator
• items
  • 官网文档：pyquery.pyquery.PyQuery.items

    PyQuery.items(selector=None)

    Iter over elements. Return PyQuery objects:

    >> d = PyQuery('<div><span>foo</span><span>bar</span></div>')
    >> [i.text() for i in d.items('span')]
    ['foo', 'bar']
    >> [i.text() for i in d('span').items()]
    ['foo', 'bar']
    

  • -> items()返回的是PyQuery=pyquery.pyquery.PyQuery的generator

举例

    <ul class="rank-list-ul" 0>

      <li id="s3170">
...
      </li>

      <li id="s692">
...
      </li>

find()

如果是find()：

carSeriesDocGenerator = merchantRankDoc.find("li[id*='s']")
print("type(carSeriesDocGenerator)=%s" % type(carSeriesDocGenerator))

则返回的是PyQuery

type(carSeriesDocGenerator)=<class 'pyquery.pyquery.PyQuery'>

然后generator转换成list后：

carSeriesDocList = list(carSeriesDocGenerator)
for curSeriesIdx, eachCarSeriesDoc in enumerate(carSeriesDocList):
    print("type(eachCarSeriesDoc)=%s" % type(eachCarSeriesDoc))

每个元素是：lxml.html.HtmlElement

type(eachCarSeriesDoc)=<class 'lxml.html.HtmlElement'>

items()

如果换成items()

carSeriesDocGenerator = merchantRankDoc.items("li[id*='s']")
print("type(carSeriesDocGenerator)=%s" % type(carSeriesDocGenerator))

则返回的是generator：

type(carSeriesDocGenerator)=<class 'generator'>

然后generator转换成list后：

carSeriesDocList = list(carSeriesDocGenerator)
for curSeriesIdx, eachCarSeriesDoc in enumerate(carSeriesDocList):
    print("type(eachCarSeriesDoc)=%s" % type(eachCarSeriesDoc))

每个元素是：pyquery.pyquery.PyQuery

type(eachCarSeriesDoc)=<class 'pyquery.pyquery.PyQuery'>