Correction for issue1265 (pdb bug with "with" statement). When an unfinished generator-iterator is garbage collected, PyEval_EvalFrameEx is called with a GeneratorExit exception set. This leads to funny results if the sys.settrace function itself makes use of generators. A visible effect is that the settrace function is reset to None. Another is that the eventual "finally" block of the generator is not called. It is necessary to save/restore the exception around the call to the trace function. This happens a lot with py3k: isinstance() of an ABCMeta instance runs def __instancecheck__(cls, instance): """Override for isinstance(instance, cls).""" return any(cls.__subclasscheck__(c) for c in {instance.__class__, type(instance)}) which lets an opened generator expression each time it returns True. Seems a backport candidate, even if the case is less frequent in 2.5.

/* implements the unicode (as opposed to string) version of the
   built-in formatters for string, int, float.  that is, the versions
   of int.__float__, etc., that take and return unicode objects */

#include "Python.h"
#include "formatter_unicode.h"

#include "../Objects/stringlib/unicodedefs.h"

#define FORMAT_STRING unicode_unicode__format__
#define FORMAT_LONG   unicode_long__format__
#define FORMAT_FLOAT  unicode_float__format__
#include "../Objects/stringlib/formatter.h"