compare dictionary values

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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