This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Title: _find_constructor does not work
Type: behavior Stage: resolved
Components: IDLE Versions: Python 3.3, Python 3.4, Python 2.7
Status: closed Resolution: out of date
Dependencies: 20122 Superseder:
Assigned To: terry.reedy Nosy List: Bernt.Røskar.Brenna, roger.serwy, terry.reedy
Priority: normal Keywords:

Created on 2010-02-08 12:11 by Bernt.Røskar.Brenna, last changed 2022-04-11 14:56 by admin. This issue is now closed.

File name Uploaded Description Edit Bernt.Røskar.Brenna, 2011-12-22 08:44
Messages (8)
msg99043 - (view) Author: Bernt Røskar Brenna (Bernt.Røskar.Brenna) * Date: 2010-02-08 12:11
Test case:

In IDLE python shell:
>>> from http.client import HTTPConnection
>>> c = HTTPConnection(

Notice that the call tip is an empty parenthesis.

This patch works for me:

$ svn diff
--- (revision 78103)
+++ (working copy)
@@ -116,7 +116,7 @@
 def _find_constructor(class_ob):
     "Find the nearest __init__() in the class tree."
-        return class_ob.__init__.__func__
+        return class_ob.__init__
     except AttributeError:
         for base in class_ob.__bases__:
             init = _find_constructor(base)
msg99048 - (view) Author: Brian Curtin (brian.curtin) * (Python committer) Date: 2010-02-08 15:47
That change works for me.
msg150047 - (view) Author: Roger Serwy (roger.serwy) * (Python committer) Date: 2011-12-21 21:50
The patch works for me as well against 3.3a0. 

Are there any cases where "__init__.__func__" would work?
msg150079 - (view) Author: Bernt Røskar Brenna (Bernt.Røskar.Brenna) * Date: 2011-12-22 08:44
Attached is Lib/test/, containing a unit test for the issue.
msg165151 - (view) Author: Roger Serwy (roger.serwy) * (Python committer) Date: 2012-07-10 03:30
Issue12510 fixes the issues listed here. I am leaving this issue open for discussing the test provided by Bernt.
msg190383 - (view) Author: Terry J. Reedy (terry.reedy) * (Python committer) Date: 2013-05-30 21:29
#12520 deleted _find_constructor in 3.x as it works with, but only with old-style classes (gone in 3.x) and just uses getattr(ob, '__init__', None). I believe the tests in this patch duplicate existing tests at the bottom of (increased from 10 to 30 as part of #12510). I will recheck when I move the existing tests into the new idle_test/
msg207821 - (view) Author: Terry J. Reedy (terry.reedy) * (Python committer) Date: 2014-01-10 02:16
The 3.x changes will not affect 2.7, which currently still uses _find_constructor. I suspect the .__func__ is needed for old-style classes, but I will try to check.
msg208705 - (view) Author: Terry J. Reedy (terry.reedy) * (Python committer) Date: 2014-01-21 21:01
THanks for reporting this. #12520 tripled the number of tests in and #20122 moved them to I think they cover this case and the tests proposed. #16630 added a few more tests and patched to make them pass. If you find any other cases that fail with the current bugfix releases, report them on a new issue.
Date User Action Args
2022-04-11 14:56:57adminsetgithub: 52131
2014-01-21 21:01:46terry.reedysetstatus: open -> closed
messages: + msg208705

assignee: terry.reedy
resolution: fixed -> out of date
stage: test needed -> resolved
2014-01-10 02:16:18terry.reedysetmessages: + msg207821
versions: + Python 3.4, - Python 3.2
2014-01-04 16:29:51serhiy.storchakasetdependencies: + Move CallTips tests to idle_tests
2013-05-30 21:32:56brian.curtinsetnosy: - brian.curtin
2013-05-30 21:29:55terry.reedysetmessages: + msg190383
versions: + Python 2.7, - Python 3.1
2012-07-10 03:30:35roger.serwysetnosy: + terry.reedy
resolution: fixed
messages: + msg165151
2011-12-22 08:44:17Bernt.Røskar.Brennasetfiles: +

messages: + msg150079
2011-12-21 21:50:05roger.serwysetnosy: + roger.serwy

messages: + msg150047
versions: + Python 3.3
2010-02-08 15:47:25brian.curtinsetpriority: normal

nosy: + brian.curtin
messages: + msg99048

stage: test needed
2010-02-08 12:11:42Bernt.Røskar.Brennacreate