<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_comments(self):
 """ Obtain comments for this bug. Returns a list of Comment instances. """

        bug = str(self._bug['id'])
        res = self._bugsy.request('bug/%s/comment' % bug)

        return [Comment(bugsy=self._bugsy, **comments) for comments
                in res['bugs'][bug]['comments']]