使用列表创建对象列表并在对象列表中搜索项目（python）

I am trying to read from a text file and make a list of objects : The objects will contain strings and lists of strings and then I need to check if a certain string is in my objects list. I keep getting the error can't covert list to string even though I put str in front of it or make a def I am trying to read from a text file and make a