使用多线程

def single_thread():
    print('single_thead begin')
  for url in blog_spider.urls:
      blog_spider.craw(url)
print("single_thread end")
def multi_thread():
    print('multi_thread begin')
  threads = []
  for url in blog_spider.urls:
       threads.append(thread.Thread(blog_spider,args=(url,)))
  for thread in threads:
      thread.start()
  for thrad in threads:
   thread.join()
  print("multi_thread end")