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I was confused for a while when seeing the thread stacks dumped by the faulthandler module. (See issue 19293.)
I propose the following tweaks of the output to make this more obvious. The first chunk changes the header written when called as _Py_DumpTraceback(), the second change the per-thread headers printed by _Py_DumpTracebackThreads().
diff -r 02f6922e6a7e Python/traceback.c
--- a/Python/traceback.c Sat Oct 19 17:04:25 2013 -0700
+++ b/Python/traceback.c Sat Oct 19 17:19:29 2013 -0700
@@ -603,7 +603,7 @@
 unsigned int depth;
 if (write_header)
- PUTS(fd, "Traceback (most recent call first):\n");
+ PUTS(fd, "Stack (most recent call first):\n");
 frame = _PyThreadState_GetFrame(tstate);
 if (frame == NULL)
@@ -642,7 +642,7 @@
 else
 PUTS(fd, "Thread 0x");
 dump_hexadecimal(sizeof(long)*2, (unsigned long)tstate->thread_id, fd);
- PUTS(fd, ":\n");
+ PUTS(fd, " (most recent call first):\n");
 }
 const char*