擅长:python、mysql、java
<p>如果您使用的是2.7,那么对于使用<a href="http://docs.python.org/library/sets.html#set-objects" rel="nofollow">set operators:</a>的交叉口来说,这是更为python的语法</p>
<pre><code>>>> import sys; print sys.version
2.7.1+ (r271:86832, Apr 11 2011, 18:13:53)
[GCC 4.5.2]
>>> rare = {"word1", "word4", "word5"}
>>> freq = {"word1", "word2", "word3"}
>>> rare & freq
set(['word1'])
</code></pre>