addItem.py

#!/usr/bin/env python

import os
from pyzabbix import ZabbixAPI, ZabbixAPIException
import sys

# The hostname at which the Zabbix web interface is available
# Replace with url to interface. Keep the quotes.
ZABBIX_SERVER = 'Zabbix Web Interface URL'

zapi = ZabbixAPI(ZABBIX_SERVER)

# Login to the Zabbix API
#replace username and password with the appropriate data. Keep the quotes around the data.
zapi.login('username', 'password')

#display hosts
command="./zhostfinder.py -A"
os.system(command)

#find a host
desire=raw_input("Please enter the name of the host to add the item to:")
host_name = desire

hosts = zapi.host.get(filter={"host": host_name}, selectInterfaces=["interfaceid"])
if hosts:
    host_id = hosts[0]["hostid"]
    print("Found host id {0}".format(host_id))
  
    #vm.memory.size[buffers] should be replaced to change the check being performed
    try:
        item = zapi.item.create(
            hostid=host_id,
            name='Check VM memory size buffers',
            key_='vm.memory.size[buffers]',
            type=0,
            value_type=3,
            interfaceid=hosts[0]["interfaces"][0]["interfaceid"],
            delay=30
        )
    except ZabbixAPIException as e:
        print(e)
        sys.exit()
    print("Added item with itemid {0} to host: {1}".format(item["itemids"][0], host_name))
else:
    print("No hosts found")