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Groups > comp.lang.python > #38154
| Date | 2013-02-04 16:26 -0800 |
|---|---|
| From | Ethan Furman <ethan@stoneleaf.us> |
| Subject | Re: LBYL vs EAFP |
| References | <5110415c$0$29986$c3e8da3$5496439d@news.astraweb.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.1344.1360025565.2939.python-list@python.org> (permalink) |
On 02/04/2013 03:16 PM, Steven D'Aprano wrote: > The eternal conflict between "Look Before You Leap" and "Easier to Ask for > Forgiveness than Permission" (LBYL vs EAFP) continues... > > I want to check that a value is a number. Let's say I don't care what sort > of number -- float, int, complex, Fraction, Decimal, something else -- just > that it is a number. Should I: > > Look Before I Leap: > > from numbers import Number > if isinstance(x, Number): > ... > else: > raise TypeError > > > or Ask Forgiveness: > > x + 0 > ... As Ian mentioned, both cases are LYBL, unless of course your addition was just an example of some mathematical code you have further down. Personally, I go with EAFP unless I'm trying to present friendlier error messages. ~Ethan~
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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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