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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
"""
from __future__ import absolute_import
from collections import Sequence, Iterator
from itertools import islice
from future.backports.misc import count # with step parameter on Py2.6
# For backward compatibility with python-future versions < 0.14.4:
_count = count
class newrange(Sequence):
"""
Pure-Python backport of Python 3's range object. See `the CPython
documentation for details:
<http://docs.python.org/py3k/library/functions.html#range>`_
"""
def __init__(self, *args):
if len(args) == 1:
start, stop, step = 0, args[0], 1
elif len(args) == 2:
start, stop, step = args[0], args[1], 1
elif len(args) == 3:
start, stop, step = args
else:
raise TypeError('range() requires 1-3 int arguments')
try:
start, stop, step = int(start), int(stop), int(step)
except ValueError:
raise TypeError('an integer is required')
if step == 0:
raise ValueError('range() arg 3 must not be zero')
elif step < 0:
stop = min(stop, start)
else:
stop = max(stop, start)
self._start = start
self._stop = stop
self._step = step
self._len = (stop - start) // step + bool((stop - start) % step)
@property
def start(self):
return self._start
@property
def stop(self):
return self._stop
@property
def step(self):
return self._step
def __repr__(self):
if self._step == 1:
return 'range(%d, %d)' % (self._start, self._stop)
return 'range(%d, %d, %d)' % (self._start, self._stop, self._step)
def __eq__(self, other):
return (isinstance(other, newrange) and
(self._len == 0 == other._len or
(self._start, self._step, self._len) ==
(other._start, other._step, self._len)))
def __len__(self):
return self._len
def index(self, value):
"""Return the 0-based position of integer `value` in
the sequence this range represents."""
try:
diff = value - self._start
except TypeError:
raise ValueError('%r is not in range' % value)
quotient, remainder = divmod(diff, self._step)
if remainder == 0 and 0 <= quotient < self._len:
return abs(quotient)
raise ValueError('%r is not in range' % value)
def count(self, value):
"""Return the number of ocurrences of integer `value`
in the sequence this range represents."""
# a value can occur exactly zero or one times
return int(value in self)
def __contains__(self, value):
"""Return ``True`` if the integer `value` occurs in
the sequence this range represents."""
try:
self.index(value)
return True
except ValueError:
return False
def __reversed__(self):
return iter(self[::-1])
def __getitem__(self, index):
"""Return the element at position ``index`` in the sequence
this range represents, or raise :class:`IndexError` if the
position is out of range."""
if isinstance(index, slice):
return self.__getitem_slice(index)
if index < 0:
# negative indexes access from the end
index = self._len + index
if index < 0 or index >= self._len:
raise IndexError('range object index out of range')
return self._start + index * self._step
def __getitem_slice(self, slce):
"""Return a range which represents the requested slce
of the sequence represented by this range.
"""
scaled_indices = (self._step * n for n in slce.indices(self._len))
start_offset, stop_offset, new_step = scaled_indices
return newrange(self._start + start_offset,
self._start + stop_offset,
new_step)
def __iter__(self):
"""Return an iterator which enumerates the elements of the
sequence this range represents."""
return range_iterator(self)
class range_iterator(Iterator):
"""An iterator for a :class:`range`.
"""
def __init__(self, range_):
self._stepper = islice(count(range_.start, range_.step), len(range_))
def __iter__(self):
return self
def __next__(self):
return next(self._stepper)
def next(self):
return next(self._stepper)
__all__ = ['newrange']