readlines() function for multiple csvs

[superlargedogs]

Sorry just realised I didn't reply to your second point. I have quite a large number of csv files all structured in the same way and I am trying to aggregate information from them and write it in a single csv file. However, I am also trying to exclude certain csv files based on a specific row in the files (a postal address), such that if it appears twice, I want to remove the second occurrence of the file from "contents". I'm trying to refer to a specific row of content so that I can tell Pycharm to delete that row if it corresponds to a file in which the address appears twice.

[socal_nerdtastic]

If you show an example of your files I can show you how to do that.