这个函数在Python中涉及urllib2和BeautifulSoup的功能是什么？

So I asked a question earlier about retrieving high scores form an html page and another user gave me the following code to help. I am new to python and beautifulsoup so I'm trying to go through some other codes piece by piece. I understand most of it but I dont get what this piece of code is and what its function is:So I asked a question earlier about retrieving