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Is this really enough? You don't want to distinguish changed files from unreadable ones?

@benjaminp do you mean refactor_dir should distinguish between files that could not be read and files that were simply not refactored?

Maybe. I suppose I want to understand the usecase for this. Starting to provide a list return value prevents us from extending the returned information in the future.

sorry, missed ths comment. my use case was to run modernize on a list of files and see which ones had and had not been changed - if modernize had touched a file at all i wanted to do extra processing on it (e.g. run a formatter), but leave untouched files alone.

Closed under bpo-45544.