def add_label(self, label):
    """Add a label, if it is not present.

    Args:
      label: The str label to set
    """
    if not self.has_label(label):
      self.add_category(scheme=LABELS_SCHEME,
                        term=(LABELS_NS, label) % '%s#%s',
                        label=label)
dataset/ETHPy150Open acil-bwh/SlicerCIP/Scripted/attic/PicasaSnap/gdata/docs/data.py/CategoryFinder.add_label/swapped operands of `%`