请问content1和content2怎么转换成同一种类型？

content_1 = selector.css('.cn').get()
content_2 = selector.css('.tCompany_main').get()
content = content_1 + content_2
报错：content = content_1 + content_2
TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'
谢谢帮助T_T

两个变量都是空值啊，所以没法相加
在相加之前，先检查一下变量是不是空值吧

content_1 = selector.css('.cn').get()
content_2 = selector.css('.tCompany_main').get()
if content_1 and content_2:
    content = content_1 + content_2