One thing that, as far as DF work goes, is much better in Py3k (in my opinion) is the segregation of text and binary data. Text strings are always made up of Unicode characters, binary data (bytes objects) are just strings of integers from 0 to 255. It makes working with binary data a load easier. It's just a shame that a lot of cool projects still haven't migrated (and that opencv library looks really cool. I might have a play with that...)
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