python os.py difference

gistfile1.py

--- python2.6/os.py	2010-04-16 16:41:14.000000000 +0200
+++ /usr/lib/python2.6/os.py	2012-10-02 00:31:53.000000000 +0200
@@ -742,22 +742,3 @@
                      _make_statvfs_result)
 except NameError: # statvfs_result may not exist
     pass
-
-if not _exists("urandom"):
-    def urandom(n):
-        """urandom(n) -> str
-
-        Return a string of n random bytes suitable for cryptographic use.
-
-        """
-        try:
-            _urandomfd = open("/dev/urandom", O_RDONLY)
-        except (OSError, IOError):
-            raise NotImplementedError("/dev/urandom (or equivalent) not found")
-        try:
-            bs = b""
-            while n - len(bs) >= 1:
-                bs += read(_urandomfd, n - len(bs))
-        finally:
-            close(_urandomfd)
-        return bs