Index: Lib/os.py
===================================================================
--- Lib/os.py	(revision 66037)
+++ Lib/os.py	(working copy)
@@ -754,7 +754,7 @@
         except (OSError, IOError):
             raise NotImplementedError("/dev/urandom (or equivalent) not found")
         bytes = ""
-        while len(bytes) < n:
+        while len(bytes) < int(n):
             bytes += read(_urandomfd, n - len(bytes))
         close(_urandomfd)
         return bytes