Python语法分析器和多线程

我有一个RSS/ATOM提要URL列表（将近500个）来解析和获取链接

我正在使用python feedparser库解析url。为了并行解析URL列表，我考虑在python中使用线程库

我的代码看起来像这样

import threading
import feedparser

class PullFeeds:
    def _init__(self):
        self.data = open('urls.txt', 'r')

    def pullfeed(self):
        threads = []
        for url in self.data:
             t = RssParser(url)
             threads.append(t)
        for thread in threads:
             thread.start()
        for thread in threads:
             thread.join()

class RssParser(threading.Thread):
     def __init__(self, url):
         threading.Thread.__init__(self)
         self.url = url

     def run(self):
         print "Starting: ", self.name
         rss_data = feedparser.parse(self.url)
         for entry in rss_data.get('entries'):
             print entry.get('link')
         print "Exiting: ", self.name


pf = PullFeeds()
pf.pullfeed()

问题是，当我运行这个脚本时，Feedparser返回了一个空列表。但是如果没有线程，feedparser会打印从提供的URL解析的链接列表

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如何解决此问题？

要查看问题是否与多线程有关，您可以尝试使用多个进程：

#!/usr/bin/env python
####from multiprocessing.dummy import Pool # use threads
from multiprocessing import Pool # use processes
from multiprocessing import freeze_support
import feedparser

def fetch_rss(url):
    try:
        data = feedparser.parse(url)
    except Exception as e:
        return url, None, str(e)
    else:
        e = data.get('bozo_exception')
        return url, data['entries'], str(e) if e else None

if __name__=="__main__":
    freeze_support()
    with open('urls.txt') as file:
        urls = (line.strip() for line in file if line.strip())
        pool = Pool(20) # no more than 20 concurrent downloads
        for url, items, error in pool.imap_unordered(fetch_rss, urls):
            if error is None:
                print(url, len(items))
            else:
                print(url, error)

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问题出在流浪汉身上。我在我的一台流浪机器里运行脚本。同样的脚本在“流浪者”框中运行良好

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这需要报告。我还不确定该向何处报告此错误，无论是Vagrant、Python线程还是Feedparser库的问题。

我会尽快与您联系。谢谢你的帮助。