The test suite breaks on the Lib/test/test_uuid.py, as of r65661. This
is because uuid3 and uuid5 now raise exceptions.

TypeError: new() argument 1 must be bytes or read-only buffer, not bytearray

The problem is due to the changes in the way "s#" now expects a
read-only buffer in PyArg_ParseTupleAndKeywords. (Which was changed in
r65661).

A rundown of the problem:

Lib/uuid.py:553 (in uuid.uuid3):
    hash = md5(namespace.bytes + bytes(name, "utf-8")).digest()

namespace.bytes is a bytearray, so the argument to md5 is a bytearray.

Modules/md5module.c:517 (in _md5.md5.new):
    if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|s#:new", kwlist,

Using s# now requires a read-only buffer, so this raises a TypeError.

The same goes for uuid5 (which calls _sha1.sha1, and has exactly the
same problem).

The commit log for r65561 suggests changing some s# into s* (which
allows readable buffers). I don't understand the ramifications here
(some problem with threading), and when I made that change, it seg
faulted, so I'll leave well enough alone. But for someone who knows more
what they're doing, that may be a more "root-of-the-problem" fix.

In the meantime, I propose this simple patch to fix uuid: I think
namespace.bytes should actually return a bytes, not a bytearray, so I'm
modifying it to return a bytes.

Related issue:
http://bugs.python.org/issue3139

Patch for r65675.
Commit log:

Fixed TypeError raised by uuid.uuid3 and uuid.uuid5, by passing a
bytearray to hash functions. Now namespace.bytes returns a bytes instead
of a bytearray.