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Re: What behavior would you expect?

References (4 earlier) <mailman.18902.1424376675.18130.python-list@python.org> <mc6emp$j1q$1@dont-email.me> <mailman.18908.1424409419.18130.python-list@python.org> <mc6hd4$j1q$2@dont-email.me> <87r3tlds2l.fsf@jester.gateway.pace.com>
Date 2015-02-20 17:21 +1100
Subject Re: What behavior would you expect?
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.18914.1424413711.18130.python-list@python.org> (permalink)

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On Fri, Feb 20, 2015 at 5:18 PM, Paul Rubin <no.email@nospam.invalid> wrote:
> Empty string would be bad.  Sometimes I like to simulate an option type,
> by returning the value as a 1-element list if there's a value, otherwise
> as an empty list.  So you could say
>
>   filename = get_filename(...)[0]
>
> if you want an exception in the failure case, or you could do something
> like
>
>   fs = get_filename(...)
>   if len(fs) == 0:  ... # didn't get a filename

Bikeshedding: That could be written as simply "if not fs". :)

ChrisA

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What behavior would you expect? Jason Friedman <jsf80238@gmail.com> - 2015-02-18 21:44 -0700
  Re: What behavior would you expect? Denis McMahon <denismfmcmahon@gmail.com> - 2015-02-19 14:16 +0000
    Re: What behavior would you expect? Chris Angelico <rosuav@gmail.com> - 2015-02-20 02:08 +1100
      Re: What behavior would you expect? Denis McMahon <denismfmcmahon@gmail.com> - 2015-02-19 20:03 +0000
        Re: What behavior would you expect? Chris Angelico <rosuav@gmail.com> - 2015-02-20 07:11 +1100
          Re: What behavior would you expect? Dan Sommers <dan@tombstonezero.net> - 2015-02-20 04:54 +0000
            Re: What behavior would you expect? Chris Angelico <rosuav@gmail.com> - 2015-02-20 16:16 +1100
              Re: What behavior would you expect? Dan Sommers <dan@tombstonezero.net> - 2015-02-20 05:40 +0000
                Re: What behavior would you expect? Jason Friedman <jsf80238@gmail.com> - 2015-02-19 22:49 -0700
                Re: What behavior would you expect? Paul Rubin <no.email@nospam.invalid> - 2015-02-19 22:18 -0800
                Re: What behavior would you expect? Chris Angelico <rosuav@gmail.com> - 2015-02-20 17:21 +1100
                Re: What behavior would you expect? Paul Rubin <no.email@nospam.invalid> - 2015-02-19 23:18 -0800

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