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1) Patch for PyErr_Raise:

I manually edited the patch file, since I had the ImportNotFound changes with it.

The entire patch is in cdiff file attached to 
http://sourceforge.net/tracker/?func=detail&atid=305470&aid=448488&group_id=5470

Meanwhile, I'm pasting below the missing section.

2) I'm going to make a quick search on the existing base for replacement opportunities.

3) CallMethodArgs vs. CallMethodArgs with keywords:

The main reason is that the implementation relies on the exsiting PyObject_CallObject function, with does 
not take keyword args...
However, your remark is relevant, and two other functions would be needed to complete the call interface:
  PyObject_CallObjectWithKW and PyObject_CallMethodArgsWithKW...
I'd say that use of keyword arg from the C API is unusual; since I've never needed them, I haven't 
implemented them...

Index: Python/errors.c
===================================================================
RCS file: /cvs/python/Python/Python/errors.c,v
retrieving revision 1.1.1.1
diff -c -r1.1.1.1 errors.c
*** Python/errors.c	2001/05/27 15:36:36	1.1.1.1
--- Python/errors.c	2001/06/05 16:11:16
***************
*** 514,519 ****
--- 514,571 ----
  }
  
  
+ PyObject* PyErr_RaiseArgs( PyObject* exctype, PyObject* args)
+ {
+ 	PyObject* exception;
+ 	exception = PyObject_CallObject( exctype, args);
+ 	if (! exception) return NULL;
+ 	PyErr_SetObject( exctype, exception);
+ 	return NULL;
+ }
+ 
+ PyObject* PyErr_Raise( PyObject* exctype, char const* format, ...)
+ {
+ 	PyObject* args = NULL, *result = NULL;
+ 	va_list va;
+ 
+ 	va_start( va, format);
+ 	  args = format ? Py_VaBuildValue( (char*)format, va) : PyTuple_New(0);
+ 	va_end(va);
+ 
+ 	if (! args) goto Finally;
+ 	if (! PyTuple_Check( args)) {
+ 		PyObject* newargs;
+ 		newargs = PyTuple_New( 1);
+ 		if (! newargs) goto Finally;
+ 		PyTuple_SET_ITEM( newargs, 0, args);
+ 		args = newargs;
+ 	}
+ 
+ 	result = PyErr_RaiseArgs( exctype, args);
+  Finally:
+ 	Py_XDECREF(args);
+ 	return result;
+ }
+ 

  PyObject *
  PyErr_NewException(char *name, PyObject *base, PyObject *dict)
  {