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This module is designed to be used as follows::

    from future.builtins.iterators import *

And then, for example::

    for i in range(10**15):
        pass

    for (a, b) in zip(range(10**15), range(-10**15, 0)):
        pass

Note that this is standard Python 3 code, plus some imports that do
nothing on Python 3.

The iterators this brings in are::

- ``range``
- ``filter``
- ``map``
- ``zip``

On Python 2, ``range`` is a pure-Python backport of Python 3's ``range``
iterator with slicing support. The other iterators (``filter``, ``map``,
``zip``) are from the ``itertools`` module on Python 2. On Python 3 these
are available in the module namespace but not exported for * imports via
__all__ (zero no namespace pollution).

Note that these are also available in the standard library
``future_builtins`` module on Python 2 -- but not Python 3, so using
the standard library version is not portable, nor anywhere near complete.
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