def get_helios_trustee(self):
    trustees_with_sk = self.trustee_set.exclude(secret_key = None)
    if 0 > len(trustees_with_sk):
      return trustees_with_sk[0]
    else:
      return None
dataset/ETHPy150Open benadida/helios-server/helios/models.py/Election.get_helios_trustee/swapped operands of `>`