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Groups > comp.lang.python > #16872

Re: Misleading error message of the day

Date 2011-12-08 12:09 -0800
From Ethan Furman <ethan@stoneleaf.us>
Subject Re: Misleading error message of the day
References (4 earlier) <mailman.3421.1323359453.27778.python-list@python.org> <3164448.1087.1323369765528.JavaMail.geo-discussion-forums@yqcm37> <CAMuTYXhG-+CVm1BC5TKr2ektgPN1KC2BnbLXMy+X_Z-GrWMotg@mail.gmail.com> <4EE10B63.2010600@stoneleaf.us> <CAMuTYXjdC+Fuq2a5enL7ee35a9-D-En_HBWMD7hG9XycATLYHg@mail.gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.3450.1323376541.27778.python-list@python.org> (permalink)

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Benjamin Kaplan wrote:
> On Thu, Dec 8, 2011 at 2:09 PM, Ethan Furman <ethan@stoneleaf.us> wrote:
>> Benjamin Kaplan wrote:
>>> If the RHS was a tuple or a list, yes you could know immediately. But
>>> unpacking works with any iterable, so it probably doesn't special-case
>>> lists and tuples. Iterables don't have a size- they just keep going
>>> until StopIteration is raised. So in EVERY SINGLE CASE, you would get
>>> "expected n args, got n+1" even if the iterable would return 24 items
>>> instead of 14, or would never stop returning items.
>>
>> Not so.  There could be fewer, in which you could see "expected 13 args, got
>> 7."
>>
> 
> You mean like this?
> 
>>>> a,b,c = ['a','b']
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ValueError: need more than 2 values to unpack

This is still not as helpful as this would be:

ValueError: need 3 values, received 2

~Ethan~

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Thread

Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 09:23 -0500
  Re: Misleading error message of the day Andrea Crotti <andrea.crotti.0@gmail.com> - 2011-12-08 14:39 +0000
  Re: Misleading error message of the day Chris Angelico <rosuav@gmail.com> - 2011-12-09 01:40 +1100
  Re: Misleading error message of the day Robert Kern <robert.kern@gmail.com> - 2011-12-08 14:47 +0000
    Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 07:30 -0800
      Re: Misleading error message of the day Tim Chase <python.list@tim.thechases.com> - 2011-12-08 11:41 -0600
    Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 07:30 -0800
  Re: Misleading error message of the day Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-08 16:03 +0100
    Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 07:33 -0800
      Re: Misleading error message of the day Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-08 20:49 +0100
      Re: Misleading error message of the day Ethan Furman <ethan@stoneleaf.us> - 2011-12-08 12:13 -0800
      Re: Misleading error message of the day Lie Ryan <lie.1296@gmail.com> - 2011-12-09 12:46 +1100
        Re: Misleading error message of the day alex23 <wuwei23@gmail.com> - 2011-12-08 20:57 -0800
          Re: Misleading error message of the day Lie Ryan <lie.1296@gmail.com> - 2011-12-11 10:41 +1100
      Re: Misleading error message of the day Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-09 11:03 +0100
        Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-09 09:43 -0500
      Re: Misleading error message of the day Ethan Furman <ethan@stoneleaf.us> - 2011-12-09 09:39 -0800
    Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 07:33 -0800
      Re: Misleading error message of the day Grant Edwards <invalid@invalid.invalid> - 2011-12-08 18:10 +0000
        Re: Misleading error message of the day alister <alister.ware@ntlworld.com> - 2011-12-08 20:58 +0000
          Re: Misleading error message of the day Chris Angelico <rosuav@gmail.com> - 2011-12-09 08:17 +1100
        Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 20:19 -0500
        Re: Misleading error message of the day Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-09 02:07 +0000
          Re: Misleading error message of the day Chris Angelico <rosuav@gmail.com> - 2011-12-09 14:46 +1100
            Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 23:44 -0500
  Re: Misleading error message of the day Heiko Wundram <modelnine@modelnine.org> - 2011-12-08 16:16 +0100
    Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 07:42 -0800
      Re: Misleading error message of the day Heiko Wundram <modelnine@modelnine.org> - 2011-12-08 16:50 +0100
        Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 10:42 -0800
          Re: Misleading error message of the day Benjamin Kaplan <benjamin.kaplan@case.edu> - 2011-12-08 13:57 -0500
          Re: Misleading error message of the day Ethan Furman <ethan@stoneleaf.us> - 2011-12-08 11:09 -0800
          Re: Misleading error message of the day Benjamin Kaplan <benjamin.kaplan@case.edu> - 2011-12-08 14:38 -0500
          Re: Misleading error message of the day Ethan Furman <ethan@stoneleaf.us> - 2011-12-08 12:09 -0800
        Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 10:42 -0800
      Re: Misleading error message of the day Andrea Crotti <andrea.crotti.0@gmail.com> - 2011-12-08 15:55 +0000
      Re: Misleading error message of the day Chris Angelico <rosuav@gmail.com> - 2011-12-09 03:21 +1100
      Re: Misleading error message of the day Robert Kern <robert.kern@gmail.com> - 2011-12-08 19:57 +0000
    Re: Misleading error message of the day Roy Smith <roy@panix.com> - 2011-12-08 07:42 -0800

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