API design question for dbf.py

Ethan Furman ethan at stoneleaf.us
Sat Jul 7 00:46:42 CEST 2012


MRAB wrote:
> On 06/07/2012 22:34, Ethan Furman wrote:
>> I'm looking for some free advice.  ;)
>>
>> My dbf module has three basic containers, all of which support list-like
>> access:  Table, List, and Index, each of which is filled with 
>> _DbfRecords.
>>
>> The fun part is that a _DbfRecord can compare equal to another
>> _DbfRecord, a _DbfRecordTemplate, a tuple with the same values in the
>> same locations, or a dict with the same keys/fields and values.
>>
>> The really fun part is __contains__:  should the __contains__ method
>> return True when a _DbfRecordTemplate, tuple, or dict is looked up in
>> the Table, List, or Index and there is a matching record?
>>
> Well, if x is in c and x == y, then y is in c. Does that help? ;-)

Heh, that's pretty much the conclusion I was coming to.  As a more 
concrete example:

--> x = 4.0
--> x in [1, 4, 7, 4, 9, 3, 4]
True

It's checking for equality, not identity.

Thinks for helping me think that through.

~Ethan~



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