Python-名称''未定义

Question

class Main: 

    PROJECT_NAME = 'something' 
    HOMEPAGE = 'something' 
    DOMAIN_NAME = get_domain_name(HOMEPAGE) 
    QUEUE_FILE = PROJECT_NAME + '/queue.txt' 
    CRAWLED_FILE = PROJECT_NAME + '/crawled.txt' 
    DATA_FILE = PROJECT_NAME + '/data.txt' 
    NUMBER_OF_THREADS = 20 
    queue = Queue() 
    Spider(PROJECT_NAME, HOMEPAGE, DOMAIN_NAME) 


    # Create worker threads (will die when main exits) 
    def create_workers(self): 
     for _ in range(self.NUMBER_OF_THREADS): 
      t = self.threading.Thread(target=self.work) 
      t.daemon = True 
      t.start() 


    # Do the next job in the queue 
    def work(self): 
     while True: 
      url = self.queue.get() 
      Spider.crawl_page(self.threading.current_thread().name, url) 
      self.queue.task_done() 


    # Each queued link is a new job 
    def create_jobs(self): 
     for link in self.file_to_set(self.QUEUE_FILE): 
      self.queue.put(link) 
     self.queue.join() 
     self.crawl() 


    # Check if there are items in the queue, if so crawl them 
    def crawl(self): 
     queued_links = self.file_to_set(self.QUEUE_FILE) 
     if len(queued_links) > 0: 
      print(str(len(queued_links)) + ' links in the queue') 
      self.create_jobs() 
create_workers() 
crawl() 

以上是我的代码。我已经收到：

NameError: name 'create_workers' is not defined and NameError: name 'crawl' is not defined.

任何帮助或建议初学者在这里？

Answer 1

您必须创建通过对象的类主要的和对象来使用它的方法，为此，你必须改变：

create_workers() 
crawl() 

到：

m = Main() 

m.create_workers() 
m.crawl()