Read battery information from System Profiler (OS X)

batteryinfo.py

#!/usr/bin/env python3

from tempfile import NamedTemporaryFile
from subprocess import call
import plistlib

with NamedTemporaryFile() as f:
    call(['system_profiler', '-xml', 'SPPowerDataType'], stdout=f)
    f.seek(0)
    p = plistlib.readPlist(f)
    d = p[0]['_items'][0]
    voltage = d['sppower_current_voltage']
    amperage = d['sppower_current_amperage']
    chargeinfo = d['sppower_battery_charge_info']
    maxcap = chargeinfo['sppower_battery_max_capacity']
    is_charging = chargeinfo['sppower_battery_is_charging']
    capacity = chargeinfo['sppower_battery_current_capacity']
    print("%d mV %d mA (full: %d mAh)" % (voltage, amperage, maxcap))