python QtWebkit：nextSibing 不返回 null 或 None

发布于 2024-11-03 01:44:37 字数 353 浏览 0 评论 0原文

下面是我用来获取给定节点的所有子节点的列表的代码片段。但是 nextSibling() 永远不会返回 null，因此 while 循环会永远执行。请帮忙。

 children = [ ]
 children.append(documentElement.firstChild())
 curr_node = children[0]
 while curr_node.nextSibling():
     print curr_node, len(children)
     children.append(curr_node.nextSibling())
     curr_node = curr_node.nextSibling()

原文

Below is the code snippet which I use to get a list of all children of the given node. But the the nextSibling() never returns null so the while loop executes forever. Please help.

 children = [ ]
 children.append(documentElement.firstChild())
 curr_node = children[0]
 while curr_node.nextSibling():
     print curr_node, len(children)
     children.append(curr_node.nextSibling())
     curr_node = curr_node.nextSibling()

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无需解释 2024-11-10 01:44:37

据我了解 nextSibling 将始终返回 QWebElement，但是您可以使用 isNull() 检查它是否为 null 元素

while not curr_node.nextSibling().isNull():
     print curr_node, len(children)
     children.append(curr_node.nextSibling())
     curr_node = curr_node.nextSibling()

您可以在 http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qwebelement.html#isNull
http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qwebelement.html#nextSibling

As i understand nextSibling will always return a QWebElement, however you can check if that is a null element using isNull()

while not curr_node.nextSibling().isNull():
     print curr_node, len(children)
     children.append(curr_node.nextSibling())
     curr_node = curr_node.nextSibling()

You can check that in http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qwebelement.html#isNull
http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qwebelement.html#nextSibling

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