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[QUOTE="Grant Edwards, post: 4100494"]
That's an infinity.

In Python 2.x, pickle doesn't handle infinities and NaNs.

IMO, it's a bug.  It's been fixed in 3.x.

If you want to pickle floating point data that includes infinities and
NaNs, you need to write your own handler for floating point values.
When pickling you need to check for infinities and NaNs and output
some defined strings.  When unpickling, you need to check for those
strings and generate infinities and NaNs as appropriate.

The CPython 2.x version of pickle just uses the underlying C library
routines to print and parse floating point values.  If those libraries
are broken in the way that they represent infinity and NaN, then
pickle is broken in the same manner.  Windows standard libraries are
broken.  When formatting floating point values, it produces strings
that it can't parse as input.

IIRC, Linux works better -- but if you want something that you know is
going to work (and work cross-platform), then you need to write your
own floating point pickle/unpickle methods, and hook them into the
pickle module.
[/QUOTE]

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