On Sat, Mar 1, 2014 at 6:09 PM, Alexander Belopolsky <ndar...@mac.com>wrote:
> On Fri, Feb 28, 2014 at 10:34 AM, Chris Barker - NOAA Federal < > chris.bar...@noaa.gov> wrote: > >> >> Whatever happened to duck typing? >> > > http://legacy.python.org/dev/peps/pep-3119/#abcs-vs-duck-typing > Sure -- but I'm afraid that there will be a lot of code that does an isinstance() check where it it absolutely unnecessary. If you really need to know if something is a sequence or a mapping, I suppose it's required, but how often is that? I suppose there are two sides to this coin: 1) Should numpy arrays use the ABC properly so that client code will recognise them as sequences -- probably, yes -- why not? (though the trick here is that numpy arrays do act differently than other mutable sequences -- view semantics and all -- so I think it's kind of dangerous) 2) If you are writing client code, should you use an isinstance() check passed-in objects? -- probably not! -CHB -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov
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