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PONeed help understanding etree xml for python working with tag structure
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  1. PONeed help understanding etree xml for python working with tag structure
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    copied!<p>i'm having some problems to unterstand the python etree library to read a xml file. I pretty new with programming in python...so xml is kind of kinky for me...</p> <p>I have the following xml structure in a file:</p> <pre><code> &lt;sss version="1.2"&gt; &lt;date&gt;2011-09-23&lt;/date&gt; &lt;time&gt;12:32:29&lt;/time&gt; &lt;origin&gt;OPST&lt;/origin&gt; &lt;user&gt;&lt;/user&gt; &lt;survey&gt; &lt;name&gt;Test&lt;/name&gt; &lt;version&gt;2011-09-02 15:50:10&lt;/version&gt; &lt;record ident="A"&gt; &lt;variable ident="10" type="quantity"&gt; &lt;name&gt;v_682&lt;/name&gt; &lt;label&gt;Another question&lt;/label&gt; &lt;position start="23" finish="24"/&gt; &lt;values&gt; &lt;range from="0" to="32"/&gt; &lt;/values&gt; &lt;/variable&gt; &lt;variable ident="11" type="quantity"&gt; &lt;name&gt;v_683&lt;/name&gt; &lt;label&gt;another totally another Question&lt;/label&gt; &lt;position start="25" finish="26"/&gt; &lt;values&gt; &lt;range from="0" to="33"/&gt; &lt;/values&gt; &lt;/variable&gt; &lt;variable ident="12" type="quantity"&gt; &lt;name&gt;v_684&lt;/name&gt; &lt;label&gt;And once more Question&lt;/label&gt; &lt;position start="27" finish="29"/&gt; &lt;values&gt; &lt;range from="0" to="122"/&gt; &lt;/values&gt; &lt;/variable&gt; &lt;variable ident="20" type="single"&gt; &lt;name&gt;v_685&lt;/name&gt; &lt;label&gt;Question with alternatives&lt;/label&gt; &lt;position start="73" finish="73"/&gt; &lt;values&gt; &lt;range from="1" to="6"/&gt; &lt;value code="1"&gt;Alternative 1&lt;/value&gt; &lt;value code="2"&gt;Alternative 2&lt;/value&gt; &lt;value code="3"&gt;Alternative 3&lt;/value&gt; &lt;value code="6"&gt;Alternative 4&lt;/value&gt; &lt;/values&gt; &lt;/variable&gt; &lt;/record&gt; &lt;/survey&gt; &lt;/sss&gt; </code></pre> <p>to read elements i developed a pretty bad loop, that does not match the capabilities of the etree library i guess...</p> <pre><code>from xml.etree.cElementTree import parse et = parse(open('scheme.xml','rb')) root = et.getroot() for i in range(4): a= str(root[4][2][i][0].text) if a.startswith('v'): print root[4][2][i][1].text </code></pre> <p>How can i make use of the tag structure: for instance to read the "value" tag for appending the text into a list?</p> <p>For me these etree tutorials are pretty difficult to gasp...maybe someone can show me how to use a tag based search...? These loops are so fragile... Thanx a lot</p>
 

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