scrapy遇到unsupported operand type(s) for +: 'Selector' and 'str'錯誤
我們經常用scrapy內置的xpath來解析頁面，獲取想要的信息，但xpath解析的返回值是一個Selector對象，不能直接與str對象進行運算，需要先調用extract（）函數來將其變成unicode編碼，之後就能與str對象進行運算了。
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