[Numpy-discussion] Views of memmaps and offset

Charles R Harris charlesr.harris@gmail....
Sat Sep 22 12:55:30 CDT 2012


On Sat, Sep 22, 2012 at 11:52 AM, Charles R Harris <
charlesr.harris@gmail.com> wrote:

>
>
> On Sat, Sep 22, 2012 at 11:31 AM, Gael Varoquaux <
> gael.varoquaux@normalesup.org> wrote:
>
>> On Sat, Sep 22, 2012 at 11:16:27AM -0600, Charles R Harris wrote:
>> >    I think this is a bug, taking a view should probably update the
>> offset.
>>
>> OK, we can include a fix for that alongside with the patch to keep track
>> of the filename.
>>
>
> It already tracks the file name
>
> In [1]: a = np.memmap('tmp.mmap', dtype=np.float64, shape=50, mode='w+',
> offset=4)
>
> In [2]: b = a[10:]
>
> In [3]: b.filename
> Out[3]: '/home/charris/tmp.mmap'
>
> or did you mean something else? I was guessing the fix could be mad in the
> same place that copied over the filename.
>
>
You can also tell it is a memmap

In [4]: b._mmap
Out[4]: <mmap.mmap at 0x2312570>

Chuck
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