script.py

import subprocess
import sys
import json

your_command = ["tshark", "-T", "ek", "-x", "-i", "tun0"]
process = subprocess.Popen(your_command, stdout=subprocess.PIPE)
for line in iter(process.stdout.readline, ''):
    # We remove blank lines with strip
    if line.strip():
        d = json.loads(line)
        if not "index" in d.keys():
            print(d)
            print("----------------")