could ildg:
> I want to check if a folder named "foldername" is empty.
> I use os.listdir(foldername)==[] to do this,
> but it will be very slow if the folder has a lot of sub-files.
> Is there any efficient ways to do this?
The first thing to do is measure the performance of this operation
in the context of your application to see if it is really worth extra
effort.
Tweaking this will depend on the platform. On Windows you can use
ctypes and the system functions FindFirstFile/FindNextFile/FindClose,
finishing once you see a single file. Directories always contain "." and
".." entries so they should be ignored. On other platforms there will be
similar low level functions.
Neil
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