Make this work on RHEL6

>>> print u"Activation key names don't not match {} != {}".format('a', 'b')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: zero length field name in format
>>> print u"Activation key names don't not match {0} != {1}".format('a', 'b')
Activation key names don't not match a != b