On 2025-08-04 19:22:23 -0600, Michael Torrie via Python-list wrote: > On 5/24/25 7:19 PM, Chris Angelico via Python-list wrote: > > for dir in dirs: > > try: open(dir + "/" + fn).close() > > except FileNotFoundError: pass > > else: break > > > > Is this really all that difficult? Not everything has to be in the stdlib. > > That would modify atime on unix file systems, no?
No, you have to actually read the file for that. Just opening is not
enough:
% ls -lu foo
-rw-r--r-- 1 hjp hjp 56 May 28 10:05 foo
% python3
Python 3.12.3 (main, Jun 18 2025, 17:59:45) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> fh = open("foo")
>>> fh.close()
>>>
% ls -lu foo
-rw-r--r-- 1 hjp hjp 56 May 28 10:05 foo
Still unchanged. But:
% python3
Python 3.12.3 (main, Jun 18 2025, 17:59:45) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> fh = open("foo")
>>> s = fh.read()
>>> fh.close()
>>>
% ls -lu foo
-rw-r--r-- 1 hjp hjp 56 Aug 9 20:31 foo
Now the atime is changed.
> Of course most modern file systems on SSDs are mounted with noatime,
> but still.
relatime is probably more common. And definitely more useful.
hjp
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