python出现RuntimeError错误问题及解决

import multiprocessing as mp
import time
from urllib.request import urlopen,urljoin
from bs4 import BeautifulSoup
import re
 
base_url = "https://morvanzhou.github.io/"
 
#crawl爬取网页
def crawl(url):
    response = urlopen(url)
    time.sleep(0.1)
    return response.read().decode()
 
#parse解析网页
def parse(html):
    soup = BeautifulSoup(html,'html.parser')
    urls = soup.find_all('a',{"href":re.compile('^/.+?/$')})
    title = soup.find('h1').get_text().strip()
    page_urls = set([urljoin(base_url,url['href'])for url in urls])
    url = soup.find('meta',{'property':"og:url"})['content']
    return title,page_urls,url
 
unseen = set([base_url])
seen = set()
restricted_crawl = True
 
pool = mp.Pool(4)
count, t1 = 1, time.time()
while len(unseen) != 0:                 # still get some url to visit
    if restricted_crawl and len(seen) > 20:
            break
    print('\nDistributed Crawling...')
    crawl_jobs = [pool.apply_async(crawl, args=(url,)) for url in unseen]
    htmls = [j.get() for j in crawl_jobs]      # request connection
 
    print('\nDistributed Parsing...')
    parse_jobs = [pool.apply_async(parse, args=(html,)) for html in htmls]
    results = [j.get() for j in parse_jobs]    # parse html
 
    print('\nAnalysing...')
    seen.update(unseen)         # seen the crawled
    unseen.clear()              # nothing unseen
 
    for title, page_urls, url in results:
        print(count, title, url)
        count += 1
        unseen.update(page_urls - seen)     # get new url to crawl
print('Total time: %.1f s' % (time.time()-t1))    # 16 s !!!

import multiprocessing as mp
import time
from urllib.request import urlopen,urljoin
from bs4 import BeautifulSoup
import re
 
base_url = "https://morvanzhou.github.io/"
 
#crawl爬取网页
def crawl(url):
    response = urlopen(url)
    time.sleep(0.1)
    return response.read().decode()
 
#parse解析网页
def parse(html):
    soup = BeautifulSoup(html,'html.parser')
    urls = soup.find_all('a',{"href":re.compile('^/.+?/$')})
    title = soup.find('h1').get_text().strip()
    page_urls = set([urljoin(base_url,url['href'])for url in urls])
    url = soup.find('meta',{'property':"og:url"})['content']
    return title,page_urls,url
 
def main():
    unseen = set([base_url])
    seen = set()
    restricted_crawl = True
 
    pool = mp.Pool(4)
    count, t1 = 1, time.time()
    while len(unseen) != 0:                 # still get some url to visit
        if restricted_crawl and len(seen) > 20:
                break
        print('\nDistributed Crawling...')
        crawl_jobs = [pool.apply_async(crawl, args=(url,)) for url in unseen]
        htmls = [j.get() for j in crawl_jobs]      # request connection
 
        print('\nDistributed Parsing...')
        parse_jobs = [pool.apply_async(parse, args=(html,)) for html in htmls]
        results = [j.get() for j in parse_jobs]    # parse html
 
        print('\nAnalysing...')
        seen.update(unseen)         # seen the crawled
        unseen.clear()              # nothing unseen
 
        for title, page_urls, url in results:
            print(count, title, url)
            count += 1
            unseen.update(page_urls - seen)     # get new url to crawl
    print('Total time: %.1f s' % (time.time()-t1))    # 16 s !!!
 
 
if __name__ == '__main__':
    main()

if __name__ == '__main__':
    main()