[Biopython-dev] Dynamic class return in Seq class

Michiel Jan Laurens de Hoon mdehoon at c2b2.columbia.edu
Thu Mar 29 23:03:22 UTC 2007

In principle, I think that using self.__class__ instead of Seq is a good 
idea. But some Biopython tests fail with this substitution. It looks 
like these failures are trivial, but we do need to find some solution 
for them.


Charles Vejnar wrote:
> Hi,
> I would like to build a class which would inherit from Seq class. But in some 
> methods of the Seq class, return is like this :
> return Seq(s, self.alphabet)
> which makes my sub-class unusable (I always get a Seq instance instead of my 
> sub-class Seq instance).
> I would like to avoid a delegation schema. So, is it possible to change the 
> returns from Seq(...) to  self.__class__(...) (as it's already done in the 
> __getslice__ method) or are there any reasons I am missing which justify 
> these returns ?
> Best regards,
> Charles
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Michiel de Hoon
Center for Computational Biology and Bioinformatics
Columbia University
1130 St Nicholas Avenue
New York, NY 10032

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