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Traversing
----------
Some jQuery traversal methods are supported. Here are a few examples.
You can filter the selection list using a string selector::
>>> d = pq('<p id="hello" class="hello"><a/></p><p id="test"><a/></p>')
>>> d('p').filter('.hello')
[<p#hello.hello>]
It is possible to select a single element with eq::
>>> d('p').eq(0)
[<p#hello.hello>]
You can find nested elements::
>>> d('p').find('a')
[<a>, <a>]
>>> d('p').eq(1).find('a')
[<a>]
Breaking out of a level of traversal is also supported using end::
>>> d('p').find('a').end()
[<p#hello.hello>, <p#test>]
>>> d('p').eq(0).end()
[<p#hello.hello>, <p#test>]
>>> d('p').filter(lambda i: i == 1).end()
[<p#hello.hello>, <p#test>]
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