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Groups > comp.lang.python > #38178

Re: LBYL vs EAFP

From Pete Forman <petef4+usenet@gmail.com>
Newsgroups comp.lang.python
Subject Re: LBYL vs EAFP
Date 2013-02-05 09:49 +0000
Organization A noiseless patient Spider
Message-ID <867gmnjdkd.fsf@gmail.com> (permalink)
References <5110415c$0$29986$c3e8da3$5496439d@news.astraweb.com> <mailman.1339.1360021575.2939.python-list@python.org> <51109001$0$21856$c3e8da3$76491128@news.astraweb.com> <mailman.1350.1360041622.2939.python-list@python.org> <5110a73a$0$21856$c3e8da3$76491128@news.astraweb.com>

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Steven D'Aprano <steve+comp.lang.python@pearwood.info> writes:
>> I want to check that a value is a number. [...]
> I'm leaning towards an isinstance check

Well that is the answer to your question, whether the value *is* a
number. EAFP can answer the question whether the value *behaves* like a
number, where the criterion depends on what your code is aiming to do
with the value.

BTW what if the value is Not-a-Number? ;-)

-- 
Pete Forman

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Thread

LBYL vs EAFP Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-05 10:16 +1100
  Re: LBYL vs EAFP Chris Angelico <rosuav@gmail.com> - 2013-02-05 10:38 +1100
    Re: LBYL vs EAFP Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-05 03:52 +0000
      Re: LBYL vs EAFP Chris Angelico <rosuav@gmail.com> - 2013-02-05 16:19 +1100
  Re: LBYL vs EAFP Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-04 16:46 -0700
    Re: LBYL vs EAFP Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-05 04:52 +0000
      Re: LBYL vs EAFP Chris Angelico <rosuav@gmail.com> - 2013-02-05 16:20 +1100
        Re: LBYL vs EAFP Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-05 06:31 +0000
          Re: LBYL vs EAFP Pete Forman <petef4+usenet@gmail.com> - 2013-02-05 09:49 +0000
            Re: LBYL vs EAFP Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-05 23:04 +1100
              Re: LBYL vs EAFP Chris Angelico <rosuav@gmail.com> - 2013-02-05 23:25 +1100
      Re: LBYL vs EAFP Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-04 22:40 -0700
  Re: LBYL vs EAFP Dave Angel <davea@davea.name> - 2013-02-04 18:55 -0500
  Re: LBYL vs EAFP Chris Angelico <rosuav@gmail.com> - 2013-02-05 11:45 +1100
  Re: LBYL vs EAFP Ethan Furman <ethan@stoneleaf.us> - 2013-02-04 16:26 -0800
  Re: LBYL vs EAFP Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-05 01:00 +0000
  Re: LBYL vs EAFP Terry Reedy <tjreedy@udel.edu> - 2013-02-05 02:53 -0500

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