code: def select_files(self, what="o"):
          
          choices = collections.OrderedDict([
              ("i", self.input_file),
              ("o", self.output_file),
              ("f", self.files_file),
              ("j", self.job_file),
              ("l", self.log_file),
              ("e", self.stderr_file),
              ("q", self.qout_file),
          ])
  
          if what == "all":
              return [getattr(v, "path") for v in choices.values()]
  
          selected = []
          for c in what:
              try:
                  selected.append(getattr(choices[c], "path"))
              except KeyError:
                  logger.warning("Wrong keyword %s" % c)
  
          return selected
docs: Helper function used to select the files of a task.
  
          Args:
              what: string with the list of characters selecting the file type
                    Possible choices:
                      i ==> input_file,
                      o ==> output_file,
                      f ==> files_file,
                      j ==> job_file,
                      l ==> log_file,
                      e ==> stderr_file,
                      q ==> qout_file,
                      all ==> all files.