[Python-Dev] PEP 471 -- os.scandir() function -- a better and faster directory iterator (original) (raw)

Jonas Wielicki j.wielicki at sotecware.net
Fri Jun 27 12:44:35 CEST 2014

On 27.06.2014 00:59, Ben Hoyt wrote:

Specifics of proposal ===================== [snip] Each DirEntry object has the following attributes and methods: [snip] Notes on caching ----------------

The DirEntry objects are relatively dumb -- the name attribute is obviously always cached, and the isX and lstat methods cache their values (immediately on Windows via FindNextFile, and on first use on Linux / OS X via a stat call) and never refetch from the system.

I find this behaviour a bit misleading: using methods and have them return cached results. How much (implementation and/or performance and/or memory) overhead would incur by using property-like access here? I think this would underline the static nature of the data.

This would break the semantics with respect to pathlib, but they’re only marginally equal anyways -- and as far as I understand it, pathlib won’t cache, so I think this has a fair point here.

regards, jwi

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