[Biopython-dev] [Bug 2454] Iterators can't use file-like objects

bugzilla-daemon at portal.open-bio.org bugzilla-daemon at portal.open-bio.org
Tue Jun 3 11:46:58 UTC 2008


------- Comment #5 from cracka80 at gmail.com  2008-06-03 07:46 EST -------
(In reply to comment #4)
> I agree that type checking is a problem.
> I am not sure if a specialized function in Bio.File is a good idea. The
> question is not if "this object is a file-like object", but "does this object
> have the attributes/methods needed". So I would prefer to add checks only for
> the required attributes/methods in each of the iterators.

The function I have written does exactly this - it checks for the necessary
attributes and methods for a given object. The iterators would then only need
to call ``File.is_filelike()`` on each object passed into them, rather than a
type checking procedure. This is in accordance with the design pattern "Program
to an 'interface', not an 'implementation'." (Gang of Four). Would you like me
to provide a diff against the current revision of Biopython, with suggested

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