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phone.py

#!/usr/bin/env python
import os, sys

def get_state():
    val = os.popen("adb shell dumpsys battery | grep level").read()
    if val:
        output = val.strip().rsplit("level: ")[1]
        output = "%s%% \n" % output
    else:
        output = "Phone Disconnected \n"
        
    return output
if __name__ == "__main__":
    val = get_state()
    sys.stdout.write(val)
    sys.stderr.write(val)