How to use the census.core.ACS3Client function in census

def __init__(self, key, year=None, session=None):

        if not session:
            session = new_session()

        self.session = session
        self.session.headers.update({
            'User-Agent': ('python-census/{} '.format(__version__) +
                           'github.com/datamade/census')
        })

        self._acs = ACS5Client(key, year, session)  # deprecated
        self.acs5 = ACS5Client(key, year, session)
        self.acs3 = ACS3Client(key, year, session)
        self.acs1 = ACS1Client(key, year, session)
        self.acs5dp = ACS5DpClient(key, year, session)
        self.acs3dp = ACS3DpClient(key, year, session)
        self.acs1dp = ACS1DpClient(key, year, session)
        self.sf1 = SF1Client(key, year, session)
        self.sf3 = SF3Client(key, year, session)

class ACS3Client(ACSClient):

    default_year = 2013
    dataset = 'acs3'

    years = (2013, 2012)

    @supported_years()
    def state_county_subdivision(self, fields, state_fips,
                                 county_fips, subdiv_fips, **kwargs):
        return self.get(fields, geo={
            'for': 'county subdivision:{}'.format(subdiv_fips),
            'in': 'state:{} county:{}'.format(state_fips, county_fips),
        }, **kwargs)

class ACS3DpClient(ACS3Client):

    dataset = 'acs3/profile'


class ACS1Client(ACSClient):

    default_year = 2017
    dataset = 'acs1'

    years = (2017, 2016, 2015, 2014, 2013, 2012, 2011)

    @supported_years()
    def state_county_subdivision(self, fields, state_fips,
                                 county_fips, subdiv_fips, **kwargs):
        return self.get(fields, geo={
            'for': 'county subdivision:{}'.format(subdiv_fips),