Trent Mick <trentm@activestate.com>: The common technique for printing out a pointer has been to cast to a long and use the "%lx" printf modifier. This is incorrect on Win64 where casting to a long truncates the pointer. The "%p" formatter should be used instead. The problem as stated by Tim: > Unfortunately, the C committee refused to define what %p conversion "looks > like" -- they explicitly allowed it to be implementation-defined. Older > versions of Microsoft C even stuck a colon in the middle of the address (in > the days of segment+offset addressing)! The result is that the hex value of a pointer will maybe/maybe not have a 0x prepended to it. Notes on the patch: There are two main classes of changes: - in the various repr() functions that print out pointers - debugging printf's in the various thread_*.h files (these are why the patch is large) Closes SourceForge patch #100505.

--- a/Python/compile.c	Fri Jun 30 16:18:57 2000 +0000
+++ b/Python/compile.c	Fri Jun 30 16:20:13 2000 +0000
@@ -130,8 +130,8 @@
 		filename = PyString_AsString(co->co_filename);
 	if (co->co_name && PyString_Check(co->co_name))
 		name = PyString_AsString(co->co_name);
-	sprintf(buf, "<code object %.100s at %lx, file \"%.300s\", line %d>",
-		name, (long)co, filename, lineno);
+	sprintf(buf, "<code object %.100s at %p, file \"%.300s\", line %d>",
+		name, co, filename, lineno);
 	return PyString_FromString(buf);
 }