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![lxml中检查元素是否含有子元素时提示Use specific 'len(elem)' or 'elem is not None' test instead.暨len函数和is not None的区别[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)
