Mark Dickinson <dicki...@gmail.com> added the comment: > Delphi uses the following code at initialization.
Yep. That would explain the problem. On x86 machines, Python's string-to-float and float-to-string conversions require that the x87 FPU has precision set to 53 bits rather than 64 bits (and also that the FPU rounding mode is round-half-to-even, but this rarely gets changed). There's a configure-time check that works out whether resetting the precision is necessary; if so, the precision is changed before each conversion and reverted again afterwards (see the _Py_SET_53BIT_PRECISION_START and _Py_SET_53BIT_PRECISION_END macros used in Python/pystrtod.c ). It looks like you may need to override these macros for PyScripter. Note that this isn't usually a problem on Windows: the default setting on Windows is 53 bit precision; I've no idea why Delphi changes it. The main problem platform is 32-bit Linux, which uses 64-bit precision by default. (And 64-bit Linux generally uses the appropriate SSE2 instructions instead of the x87; these are always 53-bit precision.) So in general there's an issue if the runtime FPU settings don't match the configure-time FPU settings. I'm not sure what the best mechanism for solving this is. Checking the FPU state before *every* conversion would be possible, I guess, but it most cases that's unnecessary. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue9980> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
