On 19.10.2020 14:47, Steve Dower wrote:
On 19Oct2020 1242, Steve Dower wrote:
On 15Oct2020 2239, Rob Cliffe via Python-Dev wrote:
TLDR: In os.scandir directory entries, atime is always a copy of mtime rather
than the actual access time.
Correction - os.stat() updates the access time to _now_, while os.scandir()
returns the last access time without updating it.
Let me correct myself first :)
*Windows* has decided not to update file access time metadata *in directory entries* on reads. os.stat() always[1] looks at the file entry
metadata, while os.scandir() always looks at the directory entry metadata.
Is this behavior documented somewhere?
Such weirdness certaintly something that needs to be documented but I really don't like describing such quirks that are out of our control
and may be subject to change in Python documentation. So we should only consider doing so if there are no other options.
My suggested approach still applies, other than the bit where we might fix os.stat(). The best we can do is regress os.scandir() to have
similarly poor performance, but the best *you* can do is use os.stat() for accurate timings when files might be being modified while your
program is running, and don't do it when you just need names/kinds (and I'm okay adding that note to the docs).
Cheers,
Steve
[1]: With some fallback to directory entries in exceptional cases that don't
apply here.
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--
Regards,
Ivan
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