Hi Justin,
I'm not sure about the other stuff, but you should do "is None"
instead of "== None" since your times are so low.
sage: a = 2
sage: timeit("a == None")
625 loops, best of 3: 420 µs per loop
sage: timeit("a is None")
625 loops, best of 3: 143 ns per loop
--Mike
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