[Python-Dev] Enums and data retrieval

Ethan Furman ethan at stoneleaf.us
Mon Apr 29 09:13:53 CEST 2013

[starting new thread to not pollute the summary thread]

On 04/28/2013 11:54 PM, Antoine Pitrou wrote:> On Sun, 28 Apr 2013 17:29:35 -0700
> Ethan Furman <ethan at stoneleaf.us> wrote:
>> Not only is this inconsistent with the rest of Python*, but it's going to be a PITA for data storage/retrieval:
>>       datastore = dbf.Table('storage.dbf', 'event_name C(50); date D; season SEASON')
>>       def retrieve_record(...):
>>           result = []
>>           for field_type, field_data in record:
>>               result.append(field_type(field_data))
> I've never seen any kind of "data retrieval" which works like that.
> Would you care to explain us the context?

The more specific context would be my dbf package, which works with dBase III, Clipper, and Foxpro tables.  When the 
fields of a record are requested they are transformed into Python data types, with code that looks pretty much like that 
retrieve_record snippet (w/o all the error checks, etc.).  And no, it doesn't support enumerations (yet).

A more general context would be anywhere that you need to convert the integer offset of an enum item back into the enum 
item itself; you may have gotten the integer offset from a postgres database, or an RPC call, and it seems to me the 
natural way get the enum item from that is with `EnumClass(offset)`.


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