send basic values gathered via 'upsc' from "network ups tools" to graphite in python3

graphite_nut.py

#!/usr/bin/env python3
#
import graphyte
import subprocess
import time

UPS_ID='apc1500@kali'
TIME_INTERVAL=15
GRAPHITE_HOST='graphite.jitter.local'
GRAPHITE_PREFIX='ups.apc1500'

graphyte.init(GRAPHITE_HOST, prefix=GRAPHITE_PREFIX)

def gather_ups():
    try:
        # call cli
        status = subprocess.check_output(['upsc', UPS_ID])
        #print(status)
        lines = status.splitlines()

        # parse roughly
        battery_charge = int(lines[0][16:19])
        battery_runtime = int(lines[3][17:21])
        battery_voltage = float(lines[6][17:21])

        ups_status = lines[29][12:14]
        # online
        if ups_status == b"OL":
            ups_status = 0
        # on battery
        elif ups_status == b"OB":
            ups_status = 1
        # battery low
        elif ups_status == b"LB":
            ups_status = -1
        # unhandled
        else:
            raise ValueError("invalid ups_status", ups_status)
        data = [('battery_charge', battery_charge),('battery_runtime', battery_runtime),('battery_voltage',battery_voltage),('ups_status', ups_status)]
    except Exception as e:
        # duh
        print('exception', e)
        # keep running
        return []
    else:
        return data

while True:
    data_ups = gather_ups()
    print(data_ups)
    for k, v in data_ups:
        #print(k, v)
        graphyte.send(k, v)
    time.sleep(TIME_INTERVAL)