Python-сообщество

.//*[@class='feed_label']

g.go('http://ok.ru/innovat',log_file='outtest2.html')
time.sleep(1)
for elem in g.doc.select(".//*[@class='feed']"):
    htmlPost = elem.html()
    
    #postValue = get_node_text(htmlPost.node(), ".//*[@class='feed_label']")
    #print postValue
 
    #if promoPost == 'DataNotFound':
    #    print 'Не рекламный пост'
    #else:
    #    print 'Рекламный пост '

>>> from lxml import etree
>>> q = etree.fromstring('<xml><hello>a</hello><x><hello>b</hello></x></xml>')
>>> q.findall('.//hello')  # XPath, recursive.
[<Element hello at 414a7c8>, <Element hello at 414a818>]

for elem in g.doc.select(".//*[@class='feed']"):
    htmlPost = elem.html()

for elem in g.doc.select(".//*[@class='feed']"):
    htmlPost = elem.html()

>>> import lxml.html
>>> 
>>> doc = lxml.html.fromstring(
...     '<a href="text1" class="text2">x</a>'
...     '<a href="text1" class="text3">y</a>'
... )
>>> 
>>> nodes = doc.xpath(r'//a[@href="text1" and @class="text2"]')
>>> 
>>> nodes
[<Element a at 0xb73ccdac>]
>>> nodes[0].attrib
{'class': 'text2', 'href': 'text1'}
>>>

>>> import lxml.html
>>> 
>>> doc = lxml.html.fromstring(
...     '<a href="text1" class="text2">x</a>'
...     '<a href="text1" class="text3">y</a>'
... )
>>> 
>>> nodes = doc.xpath(r'//a[@href="text1" and @class="text2"]')
>>> 
>>> for node in nodes:
...     lst = []
...     lst.extend(node.xpath(r'./text()'))
...     lst.extend(node.xpath(r'./@href'))
...     lst.extend(node.xpath(r'./@class'))
...     print(lst)
... 
['x', 'text1', 'text2']
>>>