def _stream(self):
        """
        Returns a generator of lines instead of a list of lines.
        """
        if self._exception:
            raise self._exception
        try:
            if self._content:
                yield self._content
            else:
                args = self.create_args()
                if args:
                    with streams.connect(*args, env=SAFE_ENV) as s:
                        yield s
                else:
                    with open(self.path, "rU") as f:  # universal newlines
                        yield f
        except StopIteration:
            raise
        except Exception as ex:
            self._exception = ex
            raise ContentException(str(ex))
Returns a generator of lines instead of a list of lines.