Issue 16967: Keyword only argument default values are evaluated before other defaults (original) (raw)
Issue16967
Created on 2013-01-14 19:37 by Kay.Hayen, last changed 2022-04-11 14:57 by admin. This issue is now closed.
| Messages (6) | ||
|---|---|---|
| msg179970 - (view) | Author: Kay Hayen (Kay.Hayen) | Date: 2013-01-14 19:37 |
| Suprisingly, keyword only arguments become evaluated first: >>> def f(a=undefined1,*,b=undefined2):pass ... Traceback (most recent call last): File "", line 1, in NameError: name 'undefined2' is not defined It should be "undefined1". I am sure, this is going to surprise developers and breaks assumptions, people tend to make. So far (to my knowledge) nothing that was separated by a "," could be evaluated in a mixed order. Please consider to change this around. | ||
| msg179972 - (view) | Author: Georg Brandl (georg.brandl) *  |
Date: 2013-01-14 19:47 |
| Looks like a bug to me, although it isn't likely to cause great harm. | ||
| msg181783 - (view) | Author: Alyssa Coghlan (ncoghlan) * |
Date: 2013-02-10 10:29 |
| Agreed on it being a bug that we do it the wrong way around, but "Yikes!" at the idea of code where it makes a significant difference. | ||
| msg181808 - (view) | Author: Roundup Robot (python-dev)  |
Date: 2013-02-10 14:32 |
| New changeset d296cf1600a8 by Benjamin Peterson in branch 'default': evaluate positional defaults before keyword-only defaults (closes #16967) http://hg.python.org/cpython/rev/d296cf1600a8 | ||
| msg181809 - (view) | Author: Roundup Robot (python-dev) |
Date: 2013-02-10 14:48 |
| New changeset 6917402c6191 by Benjamin Peterson in branch 'default': evaluate lambda keyword-only defaults after positional defaults (#16967 again) http://hg.python.org/cpython/rev/6917402c6191 | ||
| msg221151 - (view) | Author: Kay Hayen (Kay.Hayen) | Date: 2014-06-21 04:10 |
| I can confirm that Python3.4 is not affected. Python 3.3 and 3.2 still are. |
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:57:40 | admin | set | github: 61171 |
| 2014-06-21 04:10:09 | Kay.Hayen | set | messages: + |
| 2013-02-10 14:48:29 | python-dev | set | messages: + |
| 2013-02-10 14:32:36 | python-dev | set | status: open -> closednosy: + python-devmessages: + resolution: fixedstage: resolved |
| 2013-02-10 14:21:31 | benjamin.peterson | set | assignee: benjamin.petersonnosy: + benjamin.peterson |
| 2013-02-10 10:29:40 | ncoghlan | set | nosy: + ncoghlanmessages: + |
| 2013-01-14 22:42:43 | Arfrever | set | nosy: + Arfrever |
| 2013-01-14 19:47:51 | georg.brandl | set | nosy: + georg.brandlmessages: + title: Keyword keyword only default parameters are evaluated before po -> Keyword only argument default values are evaluated before other defaults |
| 2013-01-14 19:37:14 | Kay.Hayen | create |