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Unshelving the data?

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  Unshelving the data? Uncle Ben <bgreen@nycap.rr.com> - 2011-06-01 19:49 -0700
    Re: Unshelving the data? Chris Torek <nospam@torek.net> - 2011-06-02 03:24 +0000
    Re: Unshelving the data? Ben Finney <ben+python@benfinney.id.au> - 2011-06-02 13:25 +1000
    Re: Unshelving the data? Adam Tauno Williams <awilliam@whitemice.org> - 2011-06-02 06:46 -0400
      Re: Unshelving the data? Uncle Ben <bgreen@nycap.rr.com> - 2011-06-02 06:17 -0700

#6834 — Unshelving the data?

Shelving is a wonderfully simple way to get keyed access to a store of
items. I'd like to maintain this cache though.

Is there any way to remove a shelved key once it is hashed into the
system?  I could do it manually by removing the value and erasing the
key in the directory list. But is there a more elegant way?

Or should I to go the full database route?  It is not a lage
application.

Ben

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#6835

In article <4433955b-7f54-400a-af08-1f58a75e734c@j31g2000yqe.googlegroups.com>
Uncle Ben  <bgreen@nycap.rr.com> wrote:
>Shelving is a wonderfully simple way to get keyed access to a store of
>items. I'd like to maintain this cache though.
>
>Is there any way to remove a shelved key once it is hashed into the
>system?

$ pydoc shelve
...
    To summarize the interface (key is a string, data is an arbitrary
    object):
    ...
            d[key] = data   # store data at key (overwrites old data if
                            # using an existing key)
            data = d[key]   # retrieve a COPY of the data at key (raise
                            # KeyError if no such key) -- NOTE that this
                            # access returns a *copy* of the entry!
            del d[key]      # delete data stored at key (raises KeyError
                            # if no such key)
    ...

Seems pretty straightforward. :-)  Are you having some sort
of problem with "del"?
-- 
In-Real-Life: Chris Torek, Wind River Systems
Salt Lake City, UT, USA (40°39.22'N, 111°50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html

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#6836

Uncle Ben <bgreen@nycap.rr.com> writes:

> Or should I to go the full database route?  It is not a lage
> application.

I would recommend you at least investigate the use of SQLite for your
application. It is part of the standard library since Python 2.5
<URL:http://docs.python.org/library/sqlite3.html>.

-- 
 \       “Well, my brother says Hello. So, hooray for speech therapy.” |
  `\                                                      —Emo Philips |
_o__)                                                                  |
Ben Finney

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#6856

On Wed, 2011-06-01 at 19:49 -0700, Uncle Ben wrote:
> Shelving is a wonderfully simple way to get keyed access to a store of
> items. I'd like to maintain this cache though.

+1

> Is there any way to remove a shelved key once it is hashed into the
> system?  I could do it manually by removing the value and erasing the
> key in the directory list. But is there a more elegant way?

del shelve[key]

> Or should I to go the full database route?  It is not a lage
> application.

Stick with shelves.  Much simpler.

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#6862

On Jun 2, 6:46 am, Adam Tauno Williams <awill...@whitemice.org> wrote:
> On Wed, 2011-06-01 at 19:49 -0700, Uncle Ben wrote:
> > Shelving is a wonderfully simple way to get keyed access to a store of
> > items. I'd like to maintain this cache though.
>
> +1
>
> > Is there any way to remove a shelved key once it is hashed into the
> > system?  I could do it manually by removing the value and erasing the
> > key in the directory list. But is there a more elegant way?
>
> del shelve[key]
>
> > Or should I to go the full database route?  It is not a lage
> > application.
>
> Stick with shelves.  Much simpler.

Thanks.  And Chris, thanks for showing me 'pyco'. I had looked in six
thick books and had not found anything on removing keys.

Ben

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