1、sys.path[0] 返回调用python解释器的脚本所在的目录
例: HOME = sys.path[0]
HOME = '/home/jia/ssd/demo/live.py'
2、os.path.dirname() 返回当前文件的路径
例:HOME1 = os.path.dirname(HOME)
HOME1 = '/home/jia/ssd/demo/'
3、巧妙利用os.path.dirname()获取上级路径
例:HOME2 = os.path.dirname(HOME1)
HOME2 = '/home/jia/ssd/'
4、replace函数替换字符串
例:label_path = 'data/VOCdevkit2007/VOC2007/SegmentationClass/009950.png'
image_path = label_path.replace('SegmentationClass', 'JPEGImages')
image_path = image_path.replace('png', 'jpg')
image_path = 'data/VOCdevkit2007/VOC2007/JPEGImages/009950.jpg'
5、glob函数返回所有匹配的文件路径列表(list)
例:glob.glob(os.path.join(data/VOCdevkit2007/VOC2007/, 'SegmentationClass/*.png'))
参考:https://www.runoob.com/python/python-os-path.html