import os
import collections

def guangdu(path):
commonFiles = []
que = collections.deque([])
print(que)
que.append(path)
print(que)
num = 0
while len(que) != 0:

    one = que.popleft()
    filelist = os.listdir(one)
    for i in filelist:
        absPath = os.path.join(one, i)
        if os.path.isdir(absPath):
            que.append(absPath)
            num = num + 1
            print("第%d次目录"%num, que)
        else:
            commonFiles.append(absPath)
return commonFiles

arr = guangdu(r"D:\pythonfor i in arr:
print(i)