与re.findall一起使用时，Python正则表达式返回匹配的一部分

I have been trying to teach myself Python and am currently on regular expressions. The instructional text I have been using seems to be aimed at teaching Perl or some other language that is not Python, so I have had to adapt the expressions a bit to fit Python. I'm not very experienced, however, and I've hit a snag trying to get an expression to work.I have been trying to teach myself Python and a