ports/99009: py-yaml ZeroDivisionError exception
Joseph Koshy
jkoshy at FreeBSD.org
Fri Jun 16 06:00:38 UTC 2006
>Number: 99009
>Category: ports
>Synopsis: py24-yaml fails to load
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-ports-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Jun 16 06:00:35 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Joseph Koshy
>Release: FreeBSD 7.0-CURRENT i386
>Organization:
The FreeBSD Project
>Environment:
System: FreeBSD orthanc-5 7.0-CURRENT FreeBSD 7.0-CURRENT #23: Mon Jun 5 05:25:05 IST 2006 root at orthanc-5:/home/obj-current/home/src-current/sys/FCPI-OPT i386
>Description:
Python throws a ZeroDivisionError exception when the yaml library is used.
>How-To-Repeat:
Try 'import yaml' in Python.
% python
Python 2.4.2 (#2, Feb 20 2006, 21:55:20)
[GCC 2.95.4 20020320 [FreeBSD]] on freebsd4
Type "help", "copyright", "credits" or "license" for more information.
>>> import yaml
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "/usr/local/lib/python2.4/site-packages/yaml/__init__.py", line 8, in ?
from loader import *
File "/usr/local/lib/python2.4/site-packages/yaml/loader.py", line 8, in ?
from constructor import *
File "/usr/local/lib/python2.4/site-packages/yaml/constructor.py", line 187, in ?
class SafeConstructor(BaseConstructor):
File "/usr/local/lib/python2.4/site-packages/yaml/constructor.py", line 235, in SafeConstructor
nan_value = inf_value/inf_value
ZeroDivisionError: float division
>Fix:
The following patch from the Py-Yaml website fixes the problem.
Index: pyyaml/trunk/lib/yaml/constructor.py
===================================================================
--- pyyaml/trunk/lib/yaml/constructor.py (revision 147)
+++ pyyaml/trunk/lib/yaml/constructor.py (revision 168)
@@ -232,5 +232,7 @@
return sign*int(value)
- inf_value = 1e300000
+ inf_value = 1e300
+ while repr(inf_value) != repr(inf_value*inf_value):
+ inf_value *= inf_value
nan_value = inf_value/inf_value
Index: pyyaml/trunk/lib/yaml/representer.py
===================================================================
--- pyyaml/trunk/lib/yaml/representer.py (revision 152)
+++ pyyaml/trunk/lib/yaml/representer.py (revision 168)
@@ -193,7 +193,12 @@
return self.represent_scalar(u'tag:yaml.org,2002:int', unicode(data))
- repr_pos_inf = repr(1e300000)
- repr_neg_inf = repr(-1e300000)
- repr_nan = repr(1e300000/1e300000)
+ inf_value = 1e300
+ while repr(inf_value) != repr(inf_value*inf_value):
+ inf_value *= inf_value
+ nan_value = inf_value/inf_value
+
+ repr_pos_inf = repr(inf_value)
+ repr_neg_inf = repr(-inf_value)
+ repr_nan = repr(inf_value/inf_value)
def represent_float(self, data):
>Release-Note:
>Audit-Trail:
>Unformatted:
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