问urllib或json内存泄漏python 3

EN

import urllib.request, json 
import time
import resource
import gc
import contextlib

def bb():
    try:        
        with contextlib.closing(urllib.request.urlopen("https://bitbay.net/API/Public/ETHPLN/ticker.json")) as url:
        data = json.loads(url.read().decode())

        ## do something with data

        del data
        gc.collect()

    except urllib.error.HTTPError as err:
        pass


def resident_memory() -> int:
    return resource.getrusage(resource.RUSAGE_SELF).ru_maxrss


x = 0
while x == 0:
    bb()
    print('Mem usage:', resident_memory())
    time.sleep(1)