So I generally agree that FileType is not what you want for anything but quick scripts that can afford to either leave a file open or to close stdin and/or stdout. However, quick scripts are an important use case for argparse, so I don't think we should get rid of FileType.

What should definitely happen:

* Someone should add some documentation explaining the risks of using FileType (e.g. forgetting to close the file, or closing stdin/stdout when you didn't mean to).

What could potentially happen if someone really wanted it:

* Someone could create a "safe" replacement, e.g. a FileOpenerType that returns an object with open() and close() methods that do the right things (or whatever API makes sense).