gettemp_screen.py

import subprocess
import time

while 1:
    cmd = '/opt/vc/bin/vcgencmd measure_temp'
    process = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
    output, error = process.communicate()

    tempC = output.split("=")[1].replace("'C", "").strip()
    #print(tempC)

    cmd = 'zabbix_sender -z 127.0.0.1 -s "raspberrypi" -k "pitemp" -o "%s" ' % (tempC)
    print(cmd)
    process = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
    output, error = process.communicate()
    print(output)

    time.sleep(5)

To keep this process running in the background after you close your ssh session, run it in screen.