'Iterate over the code frequency per week.
Returns a weekly aggregate of the number of additions and deletions
pushed to this repository.
:param int number: (optional), number of weeks to return. Default: -1
returns all weeks
:param str etag: (optional), ETag from a previous request to the same
endpoint
:returns: generator of lists ``[seconds_from_epoch, additions,
deletions]``
.. note:: All statistics methods may return a 202. On those occasions,
you will not receive any objects. You should store your
iterator and check the new ``last_status`` attribute. If it
is a 202 you should wait before re-requesting.
.. versionadded:: 0.7'

def code_frequency(self, number=(-1), etag=None):

    url = self._build_url(u'stats', u'code_frequency', base_url=self._api)
    return self._iter(int(number), url, list, etag=etag)
