python scrapy 中解决 xpath错误 ValueError: All strings must be XML compatible: Unicode or ASCII, no NULL by

是因为 用css 或者xpath选择内容后 没有设置 只要内容 ,其中可能包含html等元素引起的

解决:

css 用 ::text"
xpath 用 //text()

末尾都加 .extract()

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