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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:
[/tmp/py3k/Lib/idlelib]
$ svn diff
Index: CallTips.py
===================================================================
--- CallTips.py (revision 78103)
+++ CallTips.py (working copy)
@@ -116,7 +116,7 @@
 def _find_constructor(class_ob):
 "Find the nearest __init__() in the class tree."
 try:
- return class_ob.__init__.__func__
+ return class_ob.__init__
 except AttributeError:
 for base in class_ob.__bases__:
 init = _find_constructor(base)

That change works for me.

The patch works for me as well against 3.3a0. 
Are there any cases where "__init__.__func__" would work?

Attached is Lib/test/test_idlelib.py, containing a unit test for the issue.

Issue12510 fixes the issues listed here. I am leaving this issue open for discussing the test provided by Bernt.

#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 CallTips.py (increased from 10 to 30 as part of #12510). I will recheck when I move the existing tests into the new idle_test/test_calltips.py.

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.

THanks for reporting this. #12520 tripled the number of tests in CallTips.py and #20122 moved them to test_calltips.py. I think they cover this case and the tests proposed. #16630 added a few more tests and patched CallTips.py to make them pass. If you find any other cases that fail with the current bugfix releases, report them on a new issue.