python运行时，找不到子路径文件的问题

问题：Traceback (most recent call last):
File "/media/aiis/project/czh/FaceDetect/tools/wider_face.py", line 14, in
from tools.data_augment import preproc, preproc1
ModuleNotFoundError: No module named 'tools.data_augment'
解决方案：添加环境中，export PYTHONPATH=/media/aiis/project/czh/FaceDetect:$PYTHONPATH