问题
how to find if the file is a link file, and find the path of the target file (actual file pointed by the link file)
回答1:
os.path.islink (is it a link?) and os.path.realpath (get ultimate pointed to path, regardless of whether it's a link).
If os.path.islink is True, and you only want to follow the first link, use os.readlink.
回答2:
Use os.lstat(), then inspect the st_mode field.
来源：https://stackoverflow.com/questions/3212712/how-to-find-target-path-of-link-if-the-file-is-a-link-file