[Tutor] Alternative for Shelve

[Timo]

Kent Johnson schreef:
> On Tue, May 12, 2009 at 4:00 AM, Timo <timomlists at gmail.com> wrote:
>   
>> Kent Johnson schreef:
>>     
>>> Try the pickle module.
>>>       
>> I went from Pickle to Shelve because I couldn't store my wanted list of
>> dictionaries in Pickle.
>>     
>
> What was the problem? You should be able to create a dict whose values
> are lists of dicts. This would correspond to the dict-like object you
> get from shelve. Then the whole dict could be pickled. For example:
>
> In [10]: import pickle
>
> In [11]: d=dict()
>
> In [12]: d[1234567] = [{'date' : '2009-05-11', 'location' :
> 'Germany'}, {'date' : '2009-05-04', 'location' : 'France'}]
>
> In [13]: d[7654321] = [{'date' : '2009-03-12', 'location' :
> 'Belgium'}, {'date' : '2009-04-23', 'location' : 'Spain'}]
>
> In [14]: s = pickle.dumps(d)
>
> In [15]: s
> Out[15]: "(dp0\nI7654321\n(lp1\n(dp2\nS'date'\np3\nS'2009-03-12'\np4\nsS'location'\np5\nS'Belgium'\np6\nsa(dp7\ng3\nS'2009-04-23'\np8\nsg5\nS'Spain'\np9\nsasI1234567\n(lp10\n(dp11\ng3\nS'2009-05-11'\np12\nsg5\nS'Germany'\np13\nsa(dp14\ng3\nS'2009-05-04'\np15\nsg5\nS'France'\np16\nsas."
>
> In [16]: d2 = pickle.loads(s)
>
> In [17]: d2
> Out[17]:
> {1234567: [{'date': '2009-05-11', 'location': 'Germany'},
>            {'date': '2009-05-04', 'location': 'France'}],
>  7654321: [{'date': '2009-03-12', 'location': 'Belgium'},
>            {'date': '2009-04-23', 'location': 'Spain'}]}
>
> Kent
>   

Hmm, I apparently missed something when I was researching it. I got 
mislead by the thing that Pickle can only have one key, but if you do it 
like this, I can indeed store multiiple ID's.

I will check this out.

Thanks,
Timo