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import time
from functools import partial
from urllib.request import urlopen


def test_speed(url, blocksize=64*1024**1):
    req = urlopen(url)
    last = time.time()
    for n, chunk in enumerate(iter(partial(req.read, blocksize), b'')):
        if n % 5 == 0:
            diff = time.time() - last
            speed = blocksize / (diff / 5) / 1024
            print(f'        \r{speed:.2f} KiB/s', end='')
            last = time.time()