问多处理池在空闲状态下有'None‘输出，但在命令提示符下有全文输出

EN

import requests
from bs4 import BeautifulSoup
import re

def scrape_ticker(url):
    
    response = requests.get(url)
    Soup = BeautifulSoup(response.content, 'html.parser')
    for i in Soup.find_all('p'):
      print(i.get_text())
        




if __name__ == '__main__' :
    urls = ['http://www.investopedia.com/investing/biotech-stocks/', 
       'https://www.fool.com/investing/2017/06/25/5-best-biotech-stocks-of-2017-so-far.aspx',
       'http://www.marketwatch.com/story/five-reasons-you-have-to-buy-biotech-stocks-now-2017-06-20',
      'http://www.kiplinger.com/slideshow/investing/T052-S003-7-battered-biotech-stocks-to-buy/index.html',
      'http://www.investors.com/research/ibd-stock-analysis/exelexis-biotech-stock-with-497-growth-positive-trial-results-nears-buy-zone-celgene-climbs/']
    

    pool = Pool(processes=2)
    print(pool.map(scrape_ticker, urls))