Bugs item #1492293, was opened at 2006-05-20 20:34
Message generated for change (Comment added) made by tim_one
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Category: Python Interpreter Core
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: David Abrahams (david_abrahams)
Assigned to: Nobody/Anonymous (nobody)
Summary: Wierd Floating Point on FreeBSD4
Initial Comment:
This is just about the weirdest thing I've ever seen.
Python 2.4.2 (#1, Jan 17 2006, 09:30:19)
[GCC 2.95.2 19991024 (release)] on freebsd4
---- nan.py ----
inf = 1e300000
nan = inf/inf
print nan
---- nan.py ----
---- tst.py ----
import nan
---- tst.py ----
% python -c "import nan"
NaN
% python -c "import tst"
NaN
Now I edit tst.py
---- tst.py ----
#
import nan
---- tst.py ----
% python -c "import nan"
Traceback (most recent call last):
File "<string>", line 1, in ?
File "nan.py", line 2, in ?
nan = inf/inf
ZeroDivisionError: float division
% python -c "import tst"
Traceback (most recent call last):
File "<string>", line 1, in ?
File "tst.py", line 1, in ?
import nan
File "nan.py", line 2, in ?
nan = inf/inf
ZeroDivisionError: float division
% rm *.pyc
% python -c "import tst"
NaN
% python -c "import nan"
Traceback (most recent call last):
File "<string>", line 1, in ?
File "nan.py", line 2, in ?
nan = inf/inf
ZeroDivisionError: float division
% python -c "import tst"
Traceback (most recent call last):
File "<string>", line 1, in ?
File "tst.py", line 1, in ?
import nan
File "nan.py", line 2, in ?
nan = inf/inf
ZeroDivisionError: float division
----------------------------------------------------------------------
>Comment By: Tim Peters (tim_one)
Date: 2006-05-21 11:09
Message:
Logged In: YES
user_id=31435
Python doesn't know anything about IEEE special values, and
in particular what the marshal format (used for code
objects) does with infinities and NaNs is a
platform-dependent accident.
Try changing
inf = 1e300000
to
inf = 1e300 * 1e300
to stop Python from _trying_ to marshal/unmarshal a floating
infinity on that box. I bet your problems will go away then.
----------------------------------------------------------------------
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