python多任务及返回值处理

废话不多说，直接上代码！

# coding:utf-8from multiprocessing import Poolimport timedef keywords(title, content, top_n=5):    print u'关键词提取...'    print title, content, top_n    time.sleep(3)    return 0, [u"晴", u"多云"]def category(title, content):    print u'文本分类...'    print title, content    time.sleep(5)    return 1, [u"天气"]def run(title, content):    keywords_list = []    category_list = []    pool = Pool(processes=2)    q = []    q.append(pool.apply_async(keywords, args=(title, content, 5)))    q.append(pool.apply_async(category, args=(title, content)))    for item in q:        r = item.get()        if r[0] == 0:            keywords_list = r[1]        elif r[0] == 1:            category_list = r[1]    pool.close()    pool.join()    return category_list, keywords_listif __name__ == "__main__":    title = u"天气预报"    content = u"北京今日天气：晴转多云"    t1 = time.time()    category_list, keywords_list = run(title, content)    print "分类结果：",  " ".join(category_list)    print "关键词提取结果", " ".join(keywords_list)    print time.time() - t1

或者：

# coding:utf-8from multiprocessing import Poolimport timedef keywords(title, content, top_n=5):    print u'关键词提取...'    print title, content, top_n    time.sleep(3)    return 0, [u"晴", u"多云"]def category(title, content):    print u'文本分类...'    print title, content    time.sleep(5)    return 1, [u"天气"]def run(title, content):    keywords_list = []    category_list = []    pool = Pool(processes=2)    q = []    q.append(pool.apply_async(keywords, args=(title, content, 5)))    keywords_list = [w["word"] for w in q[0].get()[1]]    category_list = category(title, content)[1]    pool.close()    pool.join()    return category_list, keywords_listif __name__ == "__main__":    title = u"天气预报"    content = u"北京今日天气：晴转多云"    t1 = time.time()    category_list, keywords_list = run(title, content)    print "分类结果：",  " ".join(category_list)    print "关键词提取结果", " ".join(keywords_list)    print time.time() - t1