Python 如何在代理抓取中使用While循环

因此，有时当我刮取代理时，可用代理的数量为0，如果为零，我希望这部分代码循环，直到可用检查代理的数量不为零。如果可能，请编辑代码以提供帮助，非常感谢：

def auto_scrape_and_check():
    start = datetime.now()
    loop = asyncio.get_event_loop()

    ps = ProxyScraper("socks4")
    proxies = ps.proxyscrape_scrape()
    proxies = list(proxies) + ps.spys_proxy_scrape() + ps.proxyscan_io_scrape()
    pc = ProxyChecker(proxyType="socks4", proxies=proxies) #always put http if using http/https proxies. It works for both.
    loop.run_until_complete(pc.begin_checking())

    pc.proxy_cleaner()
    
    checked = pc.clean_dupe_origin_proxies()

    pc.write_to_file(checked, "config/proxies.txt")

    pprint(checked)
    print("The proxy checking took {} seconds.".format(round((datetime.now() - start).total_seconds(), 2)))
    print("Checked {} proxies.".format(len(proxies)))
    print("There were {} usable proxies.".format(len(checked)))
    return checked