Py_Initialize(): Apply patch by Jürgen Hermann to call

    _PyImport_FixupExtension() on the exceptions module.  Now
    reload(exceptions) acts just like reload(sys) instead of raising
    an ImportError.

    This closes SF bug #422004.

Python/pythonrun.c

@@ -151,6 +151,7 @@ Py_Initialize(void)
 
 	/* initialize builtin exceptions */
 	_PyExc_Init();
+	_PyImport_FixupExtension("exceptions", "exceptions");
 
 	/* phase 2 of builtins */
 	_PyImport_FixupExtension("__builtin__", "__builtin__");