SF bug http://sourceforge.net/bugs/?func=detailbug&bug_id=130242&group_id=5470 SF patch http://sourceforge.net/patch/?func=detailpatch&patch_id=103453&group_id=5470 PyMember_Set of T_CHAR always raises exception. Unfortunately, this is a use of a C API function that Python itself never makes, so there's no .py test I can check in to verify this stays fixed. But the fault in the code is obvious, and Dave Cole's patch just as obviously fixes it.

/* Portable fmod(x, y) implementation for systems that don't have it */

#include "config.h"

#include "pyport.h"
#include <errno.h>

double
fmod(double x, double y)
{
	double i, f;
	
	if (y == 0.0) {
		errno = EDOM;
		return 0.0;
	}
	
	/* return f such that x = i*y + f for some integer i
	   such that |f| < |y| and f has the same sign as x */
	
	i = floor(x/y);
	f = x - i*y;
	if ((x < 0.0) != (y < 0.0))
		f = f-y;
	return f;
}