address #9, OverflowError in xrange
address #9, OverflowError in xrange

define and use `zrange` over `xrange`.

via: http://stackoverflow.com/questions/9816603/range-is-too-large-python, In Python 2.x, `xrange` can only handle Python 2.x ints, which are bound by the native long integer size of the platform. `range` allocates a list with all numbers beforehand on Python 2.x, and is therefore unsuitable for large arguments.
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