How to use the pyzabbix.api.ZabbixAPI function in pyzabbix

def getMetricData(config, parameters, hosts, startTime, endTime):
    """Get metric data from Zabbix API"""
    # connection to zabbix
    logger.info(
        "Begin to connect to zabbix:{} User/Pwd:{}/{}".format(str(config['ZABBIX_URL']), str(config['ZABBIX_USER']),
                                                              str(config['ZABBIX_PASSWORD'])))
    zapi = ZabbixAPI(url=config['ZABBIX_URL'], user=config['ZABBIX_USER'], password=config['ZABBIX_PASSWORD'])
    logger.info("Get connection from zabbix success")

    # get hosts
    hosts_map = {}
    hosts_ids = []
    hosts_res = zapi.do_request('host.get', {
        'filter': {
            "host": hosts,
        },
        "sortfield": "name",
        'output': 'extend'
    })
    for item in hosts_res['result']:
        host_id = item['hostid']
        host = item['host']
        hosts_ids.append(host_id)

def zabbix_network_get():
    db_zabbix = db_idc.zabbix_info
    zapi = ZabbixAPI(url=zabbix_url, user=zabbix_user, password=zabbix_pw)
    dt = datetime.datetime.now()
    now_time = time.mktime(dt.timetuple())
    old_time = dt - datetime.timedelta(days=1)
    old_time = time.mktime(old_time.timetuple())
    try:
        result = zapi.host.get(monitored_hosts=1, output='extend')
        results = {infos['hostid']:infos['host'] for infos in result}
        hostids = [infos['hostid'] for infos in result]
        items = zapi.item.get(hostids=hostids, output=["hostid", "itemid"], search={"key_": 'net.if.'})
        for item in items:
            key = "op_zabbix_network_hostid_%s" %item["hostid"]
            RC_CLUSTER.lpush(key,item["itemid"])
        itemids = [info['itemid'] for info in items]
        vals = zapi.trend.get(itemids=itemids, time_from=old_time, time_till=now_time, output=["itemid", "value_max"])
        for val in vals:
            key = "op_zabbix_network_itemid_%s" %val["itemid"]

from alerts import Alerter  # , BasicMatchString
import logging
from pyzabbix.api import ZabbixAPI
from pyzabbix import ZabbixSender, ZabbixMetric
from datetime import datetime


class ZabbixClient(ZabbixAPI):

    def __init__(self, url='http://localhost', use_authenticate=False, user='Admin', password='zabbix', sender_host='localhost',
                 sender_port=10051):
        self.url = url
        self.use_authenticate = use_authenticate
        self.sender_host = sender_host
        self.sender_port = sender_port
        self.metrics_chunk_size = 200
        self.aggregated_metrics = []
        self.logger = logging.getLogger(self.__class__.__name__)
        super(ZabbixClient, self).__init__(url=self.url, use_authenticate=self.use_authenticate, user=user, password=password)

    def send_metric(self, hostname, key, data):
        zm = ZabbixMetric(hostname, key, data)
        if self.send_aggregated_metrics: