[SciPy-User] format for chunked file save and read ?

josef.pktd@gmai... josef.pktd@gmai...
Wed Sep 22 10:41:09 CDT 2010


On Wed, Sep 22, 2010 at 11:12 AM, Robert Kern <robert.kern@gmail.com> wrote:
> On Wed, Sep 22, 2010 at 10:03,  <josef.pktd@gmail.com> wrote:
>> On Wed, Sep 22, 2010 at 10:36 AM, Robert Kern <robert.kern@gmail.com> wrote:
>>> On Wed, Sep 22, 2010 at 09:18,  <josef.pktd@gmail.com> wrote:
>>>> What is the best file format for storing temporary data, for chunked
>>>> saving and loading, that only uses numpy and scipy?
>>>
>>> An mmapped .npy file would probably serve the purpose well enough.
>>
>> Thanks, I will try.
>>
>> The old stats.models had one example with memmapped temporary storage,
>> where I never managed to figure out how to find and close an open file
>> handle (on Windows) that was not cleaned up on delete or when the
>> instance went out of scope.
>
> Use numpy.lib.format.open_memmap(). When the mmapped array goes out of
> scope, the associated file object will also get finalized.

I will have to experiment more systematically. Now I have several
memmapped files in my working directory that windows blocks as
accessed, and I'm not able to close them until I shut down the python
shell (which I don't want to do since I have other work in it.)

Thanks,

Josef

> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless
> enigma that is made terrible by our own mad attempt to interpret it as
> though it had an underlying truth."
>   -- Umberto Eco
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