The bz2 library in Python3.3b1 doesn't support iteration for text-mode properly.  Example:

>>> f = bz2.open('access-log-0108.bz2')
>>> next(f)       # Works
b'140.180.132.213 - - [24/Feb/2008:00:08:59 -0600] "GET /ply/ply.html HTTP/1.1" 200 97238\n'

>>> g = bz2.open('access-log-0108.bz2','rt')
>>> next(g)       # Fails
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration
>>>