disk based dictionaries

Larry Bates lbates at syscononline.com
Fri Dec 3 01:53:44 CET 2004


You may also want to take a look at ZODB (Zope database).
It handles the pickling, storage and retrieval of all
Python objects (including dictionaries) very well.  And yes
you can use ZODB without using Zope proper.

http://www.zope.org/Products/StandaloneZODB

http://zope.org/Members/adytumsolutions/HowToLoveZODB_PartII/HowToLoveZODB_PartI

http://www.h7.dion.ne.jp/~harm/ZODB-Tutorial.py


Larry Bates


Shivram U wrote:
> Hi,
> 
>   I want to store dictionaries on disk. I had a look at a few modules
> like bsddb, shelve etc. However would it be possible for me to do the
> following
> 
> hash[1] = [1, 2, 3] where the key is an int and not a string
> 
> bsddb requires that both the key,value are string. 
> shelve does support values being object but not the keys. Is there any
> module which support keys which are not strings
> 
> Also how do i use disk based hashes for multidimensional hashes such as
> below
> 
> #!/usr/bin/python
> 
> dict={}
> dict['key1'] = {}
> dict[('key1')][('key2')] = 'value'
> 
> key1=dict['key1']
> print key1['key2']
> 
> I have read of mxBeeDict but was unable to get it work properly. I am
> not sure if it supports what i need as i was unable to get any
> documentation about it. Is the module used widely ?
> 
> Below is how i am using the module
> 
> bdict = BeeDict('/tmp/beedict')
> 
> bdict[1] = 1
> print bdict.keys()
> 
> bdict.commit()
> bdict.close()
> 
> bdict1 = BeeDict('/tmp/beedict')
> print bdict1.keys()
> print bdict1.values()
> 
> 
> Would it be that using disk based dictionaries once opened are as fast
> as in memory dictionaries ?
> 
> Thanks in advance,
> 
> Best Regards,
> Shivram U
> 
> 
> 
> 
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