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__init__.py	6.67 KB	-rw-r--r--
newbytes.py	15.92 KB	-rw-r--r--
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newrange.py	5.17 KB	-rw-r--r--
newstr.py	15.39 KB	-rw-r--r--

Code Editor : newrange.py

"""
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 future.utils import PY2

if PY2:
    from collections import Sequence, Iterator
else:
    from collections.abc 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, other._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']

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Code Editor : newrange.py