def emails(self, qs, out):
        out.write(six.u(",\n").join(ent['email'] for ent in qs).encode(self.encoding))
        out.write("\n")
simpler single entry with email only in the format of:
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/django-extensions-1.5.0/django_extensions/management/commands/export_emails.py/Command.emails