Viewing file:  iterators.py (1.36 KB) -rw-r--r--
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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.
"""
from __future__ import division, absolute_import, print_function
import itertools
from future import utils
if not utils.PY3:
filter = itertools.ifilter
map = itertools.imap
from future.types import newrange as range
zip = itertools.izip
__all__ = ['filter', 'map', 'range', 'zip']
else:
import builtins
filter = builtins.filter
map = builtins.map
range = builtins.range
zip = builtins.zip
__all__ = []
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