import lxml.html<br>    myxml='''<br>    <cooperate><br>        <job DecreaseHour="1" table="tpa_radio_sum">  <br>        </job><br><br>        <job DecreaseHour="2" table="tpa_radio_sum">                                <br>
        </job><br><br><br>        <job DecreaseHour="3" table="tpa_radio_sum"><br>        </job><br>    </cooperate><br>    '''<br>    root=lxml.html.fromstring(myxml)<br>
    nodes1=root.xpath('//job[@DecreaseHour="1"]')<br>    nodes2=root.xpath('//job[@ne_type="101"]')<br>    print "nodes1=",nodes1<br>    print "nodes2=",nodes2<br><br>
what i get is:    <br>nodes1=[]  and  <br>nodes2=[<Element job at 0x13636f0>]      <br>why  nodes1  is  []?nodes2=[<Element job at 0x13636f0>],   <br>it is so strange thing?why ?<br>