Vladimir Janković

Yeah, I can do that. I'll start working on it.

Finally managed to spend some more time reading main code, really well written and interesting. Here is just a quick fix for this issue. Is it ok in this way...

You are right :) This piece of code inserted before "args.func(args)" does the job: ``` python if not os.path.isfile(args.input): parser.error('The file {} does not exist!'.format(args.input)) ```

@gutomaia Should I make a pull request for just this one small commit, or work on something else ? ps. I never thought I'll read and learn this much about...