已投递 刷题500左右吧 ``` # bfs tree stru of folder import os from os.path import isfile, join, basename class folder: def __init__(self,path): self.path=path self.subfolders=[] def addfolder(self,subfolder): self.subfolders.append(subfolder) def pprint(self,ind=0): print(" "*ind+basename(self.path)) for subfolder in self.subfolders: subfolder.pprint(ind+1) parent=folder(".") queue = [] queue.insert(0,parent) while queue: cur = queue.pop() for f in os.listdir(cur.path): fabspath = join(cur.path,f) if not isfile(fabspath): subfolder = folder(fabspath) cur.addfolder(subfolder) queue.insert(0,subfolder) parent.pprint() ```