[Pythonmac-SIG] Wierd Error/Bug in MacPython 2.0

[Larry Meyn]

I recall a very similar error a couple of years ago with an AppleScript.  Anything up to about 400 files worked fine.  This may not not be a MacPython bug.



>Recently, Chris Barker <chrishbarker@home.net> said:
>> I'm running MacPython 2.0 (#71, Oct 22 2000 ...) on OS-9.1
>>
>> I have a script that loops through a very large number of large files
>> (6.1 MB each), opens each one, reads it, does some NumPy crunching to
>> it, closes it, does some other stuff, and then goes to the next file. It
>> does this on batches of 500 files, and all that is in a loop so that it
>> processes many batches. I'd love it if it could do ten or so batches.
>>
>> It works fine for a while, and then it dies with a :
>>
>> IOError: [Errno 1] Operation not permitted
>>
>> on the file.close() line.
>
>This look somewhat similar (but only somewhat) to a bug I occasionally
>see, but that has so far been too elusive to track down. If I copy
>really large numbers of files (for instance when I run the MkDistr
>script to create a distribution tree for MacPython) once in a while a
>copy will fail for no apparent reason. I think that what I get is an
>IOError: [Error 0] on a write, but I'm not 100% sure.
>
>I spent a couple of days trying to track down this bug, but as it is
>non-reproducible this wasn't a success. I now specifically test for
>this case and simply try the copy another time. This seems to mask the
>bug.
>
>This strategy may or may not work for you, but I'm also interested to
>hear whether other people are seeing similar problems.
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Larry Meyn
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