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Sun Mar 29 16:42:44 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-March/087907.html

Hello,

There are a couple of ancillary portability concerns due to optimizations which
store system-dependent results of operations between constants in pyc files:

- Issue #5057: code like '\U00012345'[0] is optimized away and its result stored
as a constant in the pyc file, but the result should be different in UCS-2 and
UCS-4 builds.
- Issue #5593: code like 1e16+2.9999 is optimized away and its result stored as
a constant (again), but the result can vary slightly depending on the internal
FPU precision.

These problems have probably been there for a long time and almost no one seems
to complain, but I thought I'd report them here just in case.

Regards

Antoine.

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[Python-Dev] pyc files, constant folding and borderline portability issues