Ben,

I wanted to let you know about this, since I am using Scandir as a building block for this code. Here's a good example of scandir making a radical performance improvement over os.listdir.

https://github.com/bschollnick/Odds-and-Ends (Look for Directory_Caching.py)

I ended up doing a complete rewrite in comparison to my original os.listdir solution, and scandir dramatically sped up the code mainly due to the reduced stat vs lstat calls, I suspect.

I welcome any feedback, comments, suggestions, if you choose to take a look. But as I mentioned, I just wanted to acknowledge your code's contribution to this solution.