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Re: Interface and duck typing woes

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From Nobody <nobody@nowhere.com>
Subject Re: Interface and duck typing woes
Date Thu, 29 Aug 2013 10:41:39 +0100
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On Wed, 28 Aug 2013 18:09:22 -0300, Joe Junior wrote:

> Of course I don't want to check isistance(), I like duck typing, but
> should I check if hasattr() and callable() before adding to the container?

That won't tell you if the object has a quack() method but with
incompatible semantics (e.g. wrong number or types of arguments).

> What is the pythonic way to deal with it?

Ignore it. If you want early type checking, use a statically-typed
language.

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Interface and duck typing woes Joe Junior <joe.fbs.junior@gmail.com> - 2013-08-28 18:09 -0300
  Re: Interface and duck typing woes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-28 23:24 +0000
  Re: Interface and duck typing woes Nobody <nobody@nowhere.com> - 2013-08-29 10:41 +0100
    Re: Interface and duck typing woes Joe Junior <joe.fbs.junior@gmail.com> - 2013-08-29 09:40 -0300
      Re: Interface and duck typing woes alex23 <wuwei23@gmail.com> - 2013-08-30 10:14 +1000
      Re: Interface and duck typing woes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-30 02:42 +0000
        Re: Interface and duck typing woes Roy Smith <roy@panix.com> - 2013-08-30 06:35 -0400
          Re: Interface and duck typing woes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-31 00:13 +0000
            Re: Interface and duck typing woes Ned Batchelder <ned@nedbatchelder.com> - 2013-08-30 20:45 -0400
            Re: Interface and duck typing woes Joshua Landau <joshua@landau.ws> - 2013-09-01 00:18 +0100
            Re: Interface and duck typing woes Roy Smith <roy@panix.com> - 2013-08-31 20:52 -0400
    Re: Interface and duck typing woes Chris Angelico <rosuav@gmail.com> - 2013-08-29 23:07 +1000
    Re: Interface and duck typing woes Joe Junior <joe.fbs.junior@gmail.com> - 2013-08-29 11:11 -0300
  Re: Interface and duck typing woes jussi.santti@ard.fi - 2013-08-29 22:37 -0700

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