import xml.etree.ElementTree as ET
import subprocess
import os

def get(filename):
    if os.path.isfile(filename):
        os.remove(filename)

    try:
        detail = subprocess.run(["powercfg", "/batteryreport", "/output", filename, "/XML"], check=True)
        return 0
    except:
        return 1

def parse(filename):
    tree = ET.parse(filename)
    root = tree.getroot()

    capacity = {"design": int(root[2][0][7].text),
                "current": int(root[2][0][8].text),
                "cycle": int(root[2][0][9].text)}

    return capacity

xmlfile = "battery.xml"

get_detail = get(xmlfile)
if get_detail == 0:
    battery_about = parse(xmlfile)
    print("電池の容量 : " + str(round(battery_about["current"] / battery_about["design"] * 100, 1)) + " %")
else:
    print("エラー")