No, wrong patch. The fact that module has attribute does not mean you do not 
need to check for the errors when obtaining it.

This one I posted in another thread, it uses common python EAFP principle.

# HG changeset patch
# User ZyX <[email protected]>
# Date 1370228411 -14400
#      Mon Jun 03 07:00:11 2013 +0400
# Branch python-extended-4
# Node ID 08aaf194681a293aac74b3c394fd1c8de166912c
# Parent  aeb6697bc6851e894681f9baad6ea9dc808c6714
Clear the error in case fchdir is missing

diff -r aeb6697bc685 -r 08aaf194681a src/if_py_both.h
--- a/src/if_py_both.h  Sun Jun 02 06:58:33 2013 +0400
+++ b/src/if_py_both.h  Mon Jun 03 07:00:11 2013 +0400
@@ -5447,6 +5447,8 @@
        if (PyObject_SetAttrString(os, "fchdir", get_attr(m, "fchdir")))
            return -1;
     }
+    else
+       PyErr_Clear();
 
     return 0;
 }

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