def _mails(self, users_and_watches):
        return self.events[0]._mails(users_and_watches)
Fetches the column number (0 indexed).
dataset/ETHPy150Open mozilla/django-tidings/tidings/events.py/EventUnion._mails--crossover with--dataset/ETHPy150Open google/textfsm/texttable.py/Row.index