def __run(self, root=None):
    visited = set()
    if root is not None:
      self.__process(root)
    while self.worklist:
      current = self.worklist.pop(0)
      if visited in current:
        continue
      self.__process(current)
      visited.add(current)
dataset/ETHPy150Open neuroo/equip/equip/analysis/graph/traversals.py/Walker.__run/swapped operands of `in`