def __init__(self, *args):
    self.set = set()
    for arg in args:
      if arg not in self.LEXICON:
        raise ValueError(arg % "Behaviour %s not known.")

      self.set.add(str(arg))
dataset/ETHPy150Open google/grr/grr/lib/flow.py/Behaviour.__init__/swapped operands of `%`