def topic_test():
start = time.time()
topic = Topic("http://www.zhihu.com/topic/19550429")
topic.parser()
print "Title of the topic is ", topic.get_title()
print "Introduction of the topic is ", topic.get_introduction()
print "Number of follower of the topic is ", topic.get_follower_num()
print "Parent topics are ", topic.get_parent_topic()
print "Sample child topics are ", topic.get_sample_child_topic()
print "Top answerers of this topic are ", topic.get_top_answerer()
topic.save_latest_feed()
topic.save_top_answers() # might be time-consuming
end = time.time()
print "Time used is", end - start