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Nearly identical to xrange.py, by Dan Crosta, from

    https://github.com/dcrosta/xrange.git

This is included here in the ``future`` package rather than pointed to as
a dependency because there is no package for ``xrange`` on PyPI. It is
also tweaked to appear like a regular Python 3 ``range`` object rather
than a Python 2 xrange.

From Dan Crosta's README:

    "A pure-Python implementation of Python 2.7's xrange
built-in, with
    some features backported from the Python 3.x range built-in (which
    replaced xrange) in that version."

    Read more at
        https://late.am/post/2012/06/18/what-the-heck-is-an-xrange
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    Pure-Python backport of Python 3's range object.  See `the CPython
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    <http://docs.python.org/py3k/library/functions.html#range>`_
   
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the element at position ``index`` in the sequence
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a range which represents the requested slce
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cC@s
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R6cB@s2eZdZd�Zd�Zd�Zd�ZRS(s&An iterator for a
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