Python 3.3.0a4, please add ru'...'

[jmfauth]

Please consistency.

>>> sys.version
'3.3.0a4 (v3.3.0a4:7c51388a3aa7+, May 31 2012, 20:15:21) [MSC v.1600
32 bit (Intel)]'
>>> 'a'
'a'
>>> b'a'
b'a'
>>> br'a'
b'a'
>>> rb'a'
b'a'
>>> u'a'
'a'
>>> ur'a'
'a'
>>> ru'a'
SyntaxError: invalid syntax
>>>

jmf