#!/usr/bin/env python

import re
import time
import sys
import os
import subprocess

signal = 0
avg = 0
freq = 5

for i in range(freq):
    time.sleep(1)
    line = subprocess.check_output(["echo $(/sbin/iwconfig wlan0 | grep Signal)"], shell=True)
    sys.stdout.flush()
    try:
        found = re.search('Signal level=(.+?) dBm', line).group(1)
        signal += int(found)
    except AttributeError:
        # Value not found...
        print("Value not found. Stopping test.")
        exit()
    print found
    sys.stdout.flush()

avg = (signal/freq)
print("Average:")
print(avg)
sys.stdout.flush()