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Mark Pilgrim
2009-08-04 16:29:22 -07:00
parent d2529aeb64
commit 33f7e5ba61
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@@ -386,7 +386,7 @@ mark{display:inline}
</ol>
<blockquote class=note>
<p><span class=u>&#x261E;</span>There is a &#8220;gotcha&#8221; with the <code>find()</code> method that will eventually bite you. In a boolean context, ElementTree element objects will evaluate to <code>False</code> if they contain no children (<i>i.e.</i> if <code>len(element)</code> is <code>0</code>). The means that <code>if element.find('...')</code> is not testing whether the <code>find()</code> method found a matching element; it&#8217;s testing whether that matching element has any child elements! To test whether the <code>find()</code> method returned an element, use <code>if element.find('...') is not None</code>.
<p><span class=u>&#x261E;</span>There is a &#8220;gotcha&#8221; with the <code>find()</code> method that will eventually bite you. In a boolean context, ElementTree element objects will evaluate to <code>False</code> if they contain no children (<i>i.e.</i> if <code>len(element)</code> is <code>0</code>). This means that <code>if element.find('...')</code> is not testing whether the <code>find()</code> method found a matching element; it&#8217;s testing whether that matching element has any child elements! To test whether the <code>find()</code> method returned an element, use <code>if element.find('...') is not None</code>.
</blockquote>
<p>There <em>is</em> a way to search for <em>descendant</em> elements, <i>i.e.</i> children, grandchildren, and any element at any nesting level.