diff -up Python-2.7.3/Misc/NEWS.raise-correct-exception-when-dev-urandom-is-missing Python-2.7.3/Misc/NEWS
diff -up Python-2.7.3/Python/random.c.raise-correct-exception-when-dev-urandom-is-missing Python-2.7.3/Python/random.c
--- Python-2.7.3/Python/random.c.raise-correct-exception-when-dev-urandom-is-missing	2012-04-09 19:07:35.000000000 -0400
+++ Python-2.7.3/Python/random.c	2013-02-21 14:39:01.020988043 -0500
@@ -165,7 +165,8 @@ dev_urandom_python(char *buffer, Py_ssiz
     Py_END_ALLOW_THREADS
     if (fd < 0)
     {
-        PyErr_SetFromErrnoWithFilename(PyExc_OSError, "/dev/urandom");
+        PyErr_SetString(PyExc_NotImplementedError,
+                        "/dev/urandom (or equivalent) not found");
         return -1;
     }