Bugs item #1255395, was opened at 2005-08-09 20:15
Message generated for change (Comment added) made by rhettinger
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Category: Windows
Group: Platform-specific
Status: Closed
Resolution: Invalid
Priority: 5
Submitted By: Steven Bird (stevenbird)
Assigned to: Nobody/Anonymous (nobody)
Summary: float('-inf')
Initial Comment:
Python 2.4.1 on Windows raises "ValueError: invalid
literal for float(): -inf", though this works just fine
on unix distributions of Python 2.4.1.
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>Comment By: Raymond Hettinger (rhettinger)
Date: 2005-08-11 13:21
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FWIW, googling for the phrase does lead directly to revelant
discussion of the issues.
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Comment By: Terry J. Reedy (tjreedy)
Date: 2005-08-11 12:33
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Snide comments are out of place here. Standard C 89 is
generally considered one language even though it has many
platform dependencies. Heroic efforts, mostly volunteer, have
gone into masking many platform variations. (For instance, look
thru the C sources for system/compiler #ifdefs.) These efforts
continue.
http://docs.python.org/lib/built-in-funcs.html, float([x]) says
"Note: When passing in a string, values for NaN and Infinity may
be returned, depending on the underlying C library. The specific
set of strings accepted which cause these values to be returned
depends entirely on the C library and is known to vary."
Please read the docs before claiming that documented behavior
is a bug.
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Comment By: Michael Hudson (mwh)
Date: 2005-08-10 07:56
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Well, everything to do with special floating point values is a platform
dependent crapshoot (in fact, if you want to read more, googling for
"platform dependent crapshoot" works quite well...).
Are you interested in working on a patch? It's probably not straightforward
at all.
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Comment By: Steven Bird (stevenbird)
Date: 2005-08-10 07:49
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Oh, I thought Python 2.4.1 was the same language, regardless
of which platform it was running on. I must be missing
something here.
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Comment By: Michael Hudson (mwh)
Date: 2005-08-10 07:35
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At most, this is a feature request (why did you think it would work?).
Floating point to string (and vice versa) conversions are done by the C
library implementation, and sadly they are no consistent (you'll notice that
printing an infinite value on windows doesn't print out 'inf' either).
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