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Directory : /lib/python3/dist-packages/future/builtins/

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Current File : /lib/python3/dist-packages/future/builtins/newround.py

"""
``python-future``: pure Python implementation of Python 3 round().
"""

from future.utils import PYPY, PY26, bind_method

# Use the decimal module for simplicity of implementation (and
# hopefully correctness).
from decimal import Decimal, ROUND_HALF_EVEN


def newround(number, ndigits=None):
    """
    See Python 3 documentation: uses Banker's Rounding.

    Delegates to the __round__ method if for some reason this exists.

    If not, rounds a number to a given precision in decimal digits (default
    0 digits). This returns an int when called with one argument,
    otherwise the same type as the number. ndigits may be negative.

    See the test_round method in future/tests/test_builtins.py for
    examples.
    """
    return_int = False
    if ndigits is None:
        return_int = True
        ndigits = 0
    if hasattr(number, '__round__'):
        return number.__round__(ndigits)

    if ndigits < 0:
        raise NotImplementedError('negative ndigits not supported yet')
    exponent = Decimal('10') ** (-ndigits)

    if PYPY:
        # Work around issue #24: round() breaks on PyPy with NumPy's types
        if 'numpy' in repr(type(number)):
            number = float(number)

    if isinstance(number, Decimal):
        d = number
    else:
        if not PY26:
            d = Decimal.from_float(number).quantize(exponent,
                                                rounding=ROUND_HALF_EVEN)
        else:
            d = from_float_26(number).quantize(exponent, rounding=ROUND_HALF_EVEN)

    if return_int:
        return int(d)
    else:
        return float(d)


### From Python 2.7's decimal.py. Only needed to support Py2.6:

def from_float_26(f):
    """Converts a float to a decimal number, exactly.

    Note that Decimal.from_float(0.1) is not the same as Decimal('0.1').
    Since 0.1 is not exactly representable in binary floating point, the
    value is stored as the nearest representable value which is
    0x1.999999999999ap-4.  The exact equivalent of the value in decimal
    is 0.1000000000000000055511151231257827021181583404541015625.

    >>> Decimal.from_float(0.1)
    Decimal('0.1000000000000000055511151231257827021181583404541015625')
    >>> Decimal.from_float(float('nan'))
    Decimal('NaN')
    >>> Decimal.from_float(float('inf'))
    Decimal('Infinity')
    >>> Decimal.from_float(-float('inf'))
    Decimal('-Infinity')
    >>> Decimal.from_float(-0.0)
    Decimal('-0')

    """
    import math as _math
    from decimal import _dec_from_triple    # only available on Py2.6 and Py2.7 (not 3.3)

    if isinstance(f, (int, long)):        # handle integer inputs
        return Decimal(f)
    if _math.isinf(f) or _math.isnan(f):  # raises TypeError if not a float
        return Decimal(repr(f))
    if _math.copysign(1.0, f) == 1.0:
        sign = 0
    else:
        sign = 1
    n, d = abs(f).as_integer_ratio()
    # int.bit_length() method doesn't exist on Py2.6:
    def bit_length(d):
        if d != 0:
            return len(bin(abs(d))) - 2
        else:
            return 0
    k = bit_length(d) - 1
    result = _dec_from_triple(sign, str(n*5**k), -k)
    return result


__all__ = ['newround']

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