yapf / mypy / flake8

        Uses a fasta_file to create a numpy array of annotated FASTA-format strings

        """

        sequences = np.array([])

        sequence = []

        sequence: List[str] = []

        header_read = False

        for line in fasta_file:

          # Check if line is a header

    if len(charset) != len(set(charset)):

      raise ValueError("All values in charset must be unique.")

    self.charset = charset

    self.max_length = max_length

    if max_length is not None:

      self.max_length = int(max_length)

    else:

      self.max_length = None

  def featurize(self,

                datapoints: Iterable[Any],

    datapoints = list(datapoints)

    if (len(datapoints) < 1):

      return np.array([])

    # Featurize data using featurize() in parent class

    return Featurizer.featurize(self, datapoints, log_every_n)

    str

      String space padded to self.pad_length

    """

    if isinstance(self.max_length, int):

      return string.ljust(self.max_length)

    else:

      logger.info("DID NOT PAD: max_length is not int.")

      return string

  def untransform(self, one_hot_vectors: np.ndarray) -> str:

    """Convert from one hot representation back to original string