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| References | (3 earlier) <18647617.2258.1323358966076.JavaMail.geo-discussion-forums@yqf20> <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> |
|---|---|
| Date | 2011-12-08 14:38 -0500 |
| Subject | Re: Misleading error message of the day |
| From | Benjamin Kaplan <benjamin.kaplan@case.edu> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.3445.1323373172.27778.python-list@python.org> (permalink) |
On Thu, Dec 8, 2011 at 2:09 PM, Ethan Furman <ethan@stoneleaf.us> wrote: > Benjamin Kaplan wrote: >> >> On Thu, Dec 8, 2011 at 1:42 PM, Roy Smith <roy@panix.com> wrote: >>> >>> (some, >>> very, >>> long, >>> list, >>> of, >>> variable, >>> names, >>> to, >>> get, >>> the, >>> stuff, >>> unpacked, >>> into) = function_that_should_return_a_14_tuple() >>> >>> raises >>> >>> ValueError: too many values to unpack >>> >>> Quick, what's the bug? Did I forget a variable on the LHS, or is my >>> function returning more things than it should? I know it's supposed to be >>> 14, but I don't know which side is wrong. Had it said "... expected 13, got >>> 14", I would know immediately. >>> >> >> 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
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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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