Created on 2013-01-14 19:37 by Kay.Hayen, last changed 2014-06-21 04:10 by Kay.Hayen. This issue is now closed.
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| 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 "<stdin>", line 1, in <module> 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. |
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| 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. |
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| msg181783 - (view) | Author: Nick 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. |
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| 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 |
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| 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 |
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| 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. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2014-06-21 04:10:09 | Kay.Hayen | set | messages: + msg221151 |
| 2013-02-10 14:48:29 | python-dev | set | messages: + msg181809 |
| 2013-02-10 14:32:36 | python-dev | set | status: open -> closed nosy: + python-dev messages: + msg181808 resolution: fixed stage: resolved |
| 2013-02-10 14:21:31 | benjamin.peterson | set | assignee: benjamin.peterson nosy: + benjamin.peterson |
| 2013-02-10 10:29:40 | ncoghlan | set | nosy:
+ ncoghlan messages: + msg181783 |
| 2013-01-14 22:42:43 | Arfrever | set | nosy:
+ Arfrever |
| 2013-01-14 19:47:51 | georg.brandl | set | nosy:
+ georg.brandl messages: + msg179972 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 | |