Server tester

#!/usr/bin/env python3

import random
import string
import time
import sys
import json


while True:
    chunk = ''
    for i in range(random.randrange(1, 6)):
        chunk += json.dumps({
            'command': 'upper',
            'data': ''.join([random.choice(string.ascii_lowercase) 
                for i in range(random.randrange(1, 20))])
        })
        chunk += '\r\n'
    sys.stdout.write(chunk)
    sys.stdout.flush()
    time.sleep(0.1)