[Tutor] try and file existence
cs at zip.com.au
Sun Aug 16 01:00:50 CEST 2015
On 15Aug2015 15:20, Clayton Kirkwood <crk at godblessthe.us> wrote:
>> Behalf Of Laura Creighton
>> To: boB Stepp <robertvstepp at gmail.com>
>> In a message of Sat, 15 Aug 2015 14:24:21 -0500, boB Stepp writes:
>> >I understand your points, but wonder then what is the intended use for
>> >os.path.exists()? That is, in what types of circumstances would it be
>> >both appropriate and safe to use?
>> If you want to locate dangling symlinks, os.path.exists will return False, so
>> the symlink is there, but the file it pointed to is long gone.
>Can't you do that with os.path.open() and get a value in os.path.status? (I
>think that is the thing to call)
Open does more that os.stat (which is what os.path.exists uses underneath).
There are plenty of times you will want to know a file exists but not have
permission to open it. Also, open can have side effects if the target file is a
device or a socket/pipe.
Always use the smallest thing you can to achieve an effect: stat is smaller
Cameron Simpson <cs at zip.com.au>
Q: How many user support people does it take to change a light bulb?
A: We have an exact copy of the light bulb here and it seems to be
working fine. Can you tell me what kind of system you have?
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