import threading
import time


def start_extraction_threads(in_urls, items_data, target):
    """Starts a predefined number of threads to scrape data.
    """
    threads = list()
    for _ in range(0, 3):
        x = threading.Thread(target=target,
            args=(in_urls, items_data))
        x.start()
        threads.append(x)
        time.sleep(3)
    
    return threads