run fping and parse its output, "unreachable" or json stats. requires python 3.5. made for use with zabbix.

ping_host.py

#!/usr/bin/env python3

import sys
import json
import subprocess

# '1.1.1.1 : xmt/rcv/%loss = 1/1/0%, min/avg/max = 1.35/1.35/1.35'

def parse(s):
    data = {}

    # sorry, I've been doing too much Erlang lately
    [host, s1]          = s.split(" : ")
    [stats, ping]       = s1.split(", ")

    # get packet loss %
    [_, s2]             = stats.split(" = ")
    [sent, recv, loss]  = s2.split("/")

    # get avg latency
    [_, s3]             = ping.split(" = ")
    [min_, avg, max_]   = s3.split("/")

    return {
        "host": host,
        "sent": sent,
        "recv": recv,
        "loss": loss.strip("%"),
        "min":  min_,
        "avg":  avg,
        "max":  max_
    }

def main(host, key):
    key = key.lower()

    if key not in "host sent recv loss min avg max".split():
        sys.exit(1)
        
    cmd = subprocess.run(["/usr/sbin/fping", "-q", "-c2", host],
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT)

    output = cmd.stdout.decode("utf-8").strip()

    parsed = parse(output)

    print(parsed[key])

    sys.exit(0)

if __name__ == "__main__":
    if len(sys.argv) != 3:
        sys.exit(1)

    main(sys.argv[1], sys.argv[2])