print CPU temperature on Raspberry Pi

import subprocess
import time

while True:
    args = ['cat', '/sys/class/thermal/thermal_zone0/temp']
    try:
        res = subprocess.Popen(args, stderr=subprocess.PIPE, stdout=subprocess.PIPE)
    except:
        print("Error.")

    output = res.communicate()
    tempature = int(output[0]) / 1000.0
    print('cpu tempature = {0:.4f}℃'.format(tempature))
    time.sleep(5)