':return: æè¿åšæïŒè¿åçæåšïŒå·äœè¯Žæè§ :class:`.Activity`
:rtype: Activity.Iterable'

@property
def activities(self):

    from .activity import Activity
    if (self.url is None):
        return
    gotten_feed_num = 20
    start = '0'
    api_url = (self.url + 'activities')
    while (gotten_feed_num == 20):
        data = {'_xsrf': self.xsrf, 'start': start}
        res = self._session.post(api_url, data=data)
        gotten_feed_num = res.json()['msg'][0]
        soup = BeautifulSoup(res.json()['msg'][1])
        acts = soup.find_all('div', class_='zm-profile-section-item    zm-item    clearfix')
        start = (acts[(-1)]['data-time'] if (len(acts) > 0) else 0)
        for act in acts:
            if (act.attrs['data-type-detail'] == 'member_follow_roundtable'):
                continue
            (yield Activity(act, self._session, self))
