What's a good way to compare values in dictionaries? I want to find 
values that have changed. I look for new keys by doing this:

new = [k for k in file_info_cur.iterkeys() if k not in 
file_info_old.iterkeys()]
         if new == []:
             print new, "No new files."
         else:
             print new, "New file(s)!!!"

My key-values pairs are filepaths and their modify times. I want to 
identify files that have been updated or added since the script last ran.

Thanks,
rbt
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