Random cleanup, some of which may enhance performance.
Random cleanup, some of which may enhance performance.

More performace gains could be got by dumping with iterators/generators
but that's post beta 1.

Please use `list.append(item)` instead of `list += [item]`.
The former is both idiomatic and 2x faster:
http://stackoverflow.com/questions/725782/python-list-concatenation-what-is-difference-in-append-and

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