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More on multithreading

Counting semaphore

Report a typo

Analyze the following code block and select the best option.

import time
from threading import Thread, Semaphore
from urllib.request import urlopen

control_threads = Semaphore(5)


def open_website(url):
    with control_threads:
        time.sleep(3)
        return urlopen(url)


for _ in range(20):
    t = Thread(target=open_website, args=("https://www.python.org/",))
    t.start()

Select one option from the list

The Semaphore class instance control_threads allows five threads to open the url at the same time

The Semaphore class instance control_threads blocks access to the url for five seconds

20 threads are created and released after three seconds

The script fails because the threads were never released

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