如何在避免MemoryError的同时在大型文件系统中查找重复文件

I am trying to avoid duplicates in my mp3 collection (quite large). I want to check for duplicates by checking file contents, instead of looking for same file name. I have written the code below to do this but it throws a MemoryError after about a minute. Any suggestions on how I can get this to work?I am trying to avoid duplicates in my mp3 colle