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The new warnings implementation tweaks how tracebacks are printed. This 
introduced a bug where the exception name is indented when it shouldn't 
be: e.g., ``raise KeyError`` should look like::
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 KeyError
not::
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 KeyError

Forgot to mention this is probably from Python/traceback.c:tb_displayline().

It looks like you can just remove the offending line like so:
Index: Python/traceback.c
===================================================================
--- Python/traceback.c (revision 62515)
+++ Python/traceback.c (working copy)
@@ -222,8 +222,7 @@
 err = PyFile_WriteString(linebuf, f);
 if (err != 0)
 return err;
-
- err = PyFile_WriteString(" ", f);
+
 return Py_DisplaySourceLine(f, filename, lineno);
 }

Yep. I already did that and ran the unit test suite to verify. Now I am 
just trying to figure out how to best test it. It seems it only comes up 
for printing a traceback. That would mean either using subprocess to run 
another interpreter and capture its output or cheat and use ctypes. I 
don't like either solution.

You could add a function to the _testcapi module to invoke PyErr_Display.

On Sun, Apr 27, 2008 at 2:34 AM, Georg Brandl <report@bugs.python.org> wrote:
>
> Georg Brandl <georg@python.org> added the comment:
>
> You could add a function to the _testcapi module to invoke PyErr_Display.
>
That's true and probably the only sane idea.

Fix in revision 62555.