多线程，不太熟悉，求指教

史莱克

2采用python实现多线程读取多个文本文件，每个线程将处理的文本文件按照单词出现频次进行统计，最后将多个线程的统计结果汇总并按照单词出现频次从高到低排列，请给出调试后可执行的源码以及输出结果



文件1内容：

　If You Think You Are

　By Walter D. Wintle

　　If you think you are beaten, you are





文件2内容：

　　If you think you dare not, you don't

　　If you think to win but you think you can't

　　It's almost certain you won't



文件3内容：

　If you think you'll lose, you've lost

　　For out of the world we find

史莱克

词频统计我会，线程不熟悉