code: def read_from(value):
      
      path = normalized_path(value)
      if not os.path.exists(path):
          raise argparse.ArgumentTypeError("%s is not a valid path." % path)
      LOG.debug("%s exists.", path)
      with open(path, 'r') as reader:
          read = reader.read()
      return read
docs: Read file and return contents.