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# lxml len is not None lxml Python 子元素
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![lxml中檢查元素是否含有子元素時提示Use specific 'len(elem)' or 'elem is not None' test instead.暨len函數和is not None的差別[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)
