Python——Bug解决：文件存在但os.path.exists或os.path.isfile返回false

问题

python脚本访问路径，前一级路径存在，但文件不存在：

bash 复制代码

(Pdb) os.path.isfile(f"/mnt/flan_t5_large-adversarial_qa_dbert_tell_what_it_is/adapter_model.bin")
False
(Pdb) os.path.isfile(f"/mnt/flan_t5_large-adversarial_qa_dbert_tell_what_it_is")
True

命令行ls看，是存在的：

bash 复制代码

>>> ls /mnt/flan_t5_large-adversarial_qa_dbert_tell_what_it_is/adapter_model.bin
/mnt/flan_t5_large-adversarial_qa_dbert_tell_what_it_is/adapter_model.bin

可能问题原因及解决方法

1.

os.path.exists()的含义及文件存在但os.path.exists()返回False的原因

2.

参考回答：https://stackoverflow.com/questions/23125857/python-os-path-exists-cant-locate-the-file-however-the-file-indeed-exists

原因：s.path.exists(path) Return True if path refers to an existing path. Returns False for broken symbolic links. On some platforms, this function may return False if permission is not granted to execute os.stat() on the requested file, even if the path physically exists. maybe this is your problem.

总结就是权限问题。

给权限即可。

反转

但我发现这个权限也没问题，而且最重要的是我发现它只是个软链接，因此这个文件不存在极可能是由于原文件不存在了：

bash 复制代码

>>> ls -l /mnt/flan_t5_large-adversarial_qa_dbert_tell_what_it_is/adapter_model.bin
lrwxrwxrwx 1 gaohongzhi gaohongzhi 179 Nov  2 15:38 /mnt/flan_t5_large-adversarial_qa_dbert_tell_what_it_is/adapter_model.bin -> ../../../../../../.cache/huggingface/hub/models--lorahub--flan_t5_large-adversarial_qa_dbert_tell_what_it_is/blobs/37a8d9c6732bfab95b168e90e02363d8a254ad1ac208fc32f9e61b2c693f5230

果然这玩意就什么都不是！所以还是文件有问题导致的！

bash 复制代码

>>> ls -l /.cache/huggingface/hub/models--lorahub--flan_t5_large-adversarial_qa_dbert_tell_what_it_is/blobs/37a8d9c6732bfab95b168e90e02363d8a254ad1ac208fc32f9e61b2c693f5230