[issue5657] bad repr of itertools.count object with negative value on OS X 10.4 with 10.5 build

[Ned Deily]

New submission from Ned Deily <nad at acm.org>:

Observed failure of regression test:

======================================================================
FAIL: test_count (test.test_itertools.TestBasicOps)
----------------------------------------------------------------------
Traceback (most recent call last):
  File 
"/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/test/te
st_itertools.py", line 215, in test_count
    self.assertEqual(repr(c), 'count(-9)')
AssertionError: 'count(4294967287)' != 'count(-9)'


Problem can be reproduced using the python.org 3.0.1 OS X installer on a 
PPC (G3) system running 10.4:

/Library/Frameworks/Python.framework/Versions/3.0$ bin/python3.0
Python 3.0.1 (r301:69597, Feb 14 2009, 19:03:52) 
[GCC 4.0.1 (Apple Inc. build 5490)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from itertools import count
>>> x = count(-2)
>>> x
count(4294967294)
>>> next(x)
-2
>>> x
count(4294967295)
>>> next(x)
-1
>>> x
count(0)
>>> next(x)
0
>>> x
count(1)
>>> 
nad at pbg3:/Library/Frameworks/Python.framework/Versions/3.0$ uname -a
Darwin pbg3.baybryj.net 8.11.0 Darwin Kernel Version 8.11.0: Wed Oct 10 
18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC Power Macintosh 
powerpc

But the same installer on another PPC (G4) system running 10.5 works 
fine:

/Library/Frameworks/Python.framework/Versions/3.0$ bin/python3.0
Python 3.0.1 (r301:69597, Feb 14 2009, 19:03:52) 
[GCC 4.0.1 (Apple Inc. build 5490)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from itertools import count
>>> x = count(-2)
>>> x
count(-2)
>>> next(x)
-2
>>> 
nad at pbg4:/Library/Frameworks/Python.framework/Versions/3.0$ uname -a
Darwin pbg4.local 9.6.0 Darwin Kernel Version 9.6.0: Mon Nov 24 17:39:01 
PST 2008; root:xnu-1228.9.59~1/RELEASE_PPC Power Macintosh

Further analysis shows that the problem is reproducible on the 10.4 
system with any current build (2.x/3.x) if the installer build is made 
on a 10.5 system with the default deployment target of 10.3; the correct 
results are seen if the image is installed on a 10.5 system.  If the 
same source snapshot is used to build an installer image on the 10.4 
system, the resulting image does not exhibit this bug, either on the 
10.4 or on 10.5 systems.  

More analysis is needed.

It would be helpful if anyone with access to another 10.4 PPC or Intel 
system could try the above code snippet using the 3.0.1 OS X from 
python.org.

----------
components: Macintosh
messages: 85081
nosy: nad, ronaldoussoren
severity: normal
status: open
title: bad repr of itertools.count object with negative value on OS X 10.4 with 10.5 build
versions: Python 2.6, Python 2.7, Python 3.0, Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5657>
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