utils.py 文件源码

def float_to_decimal(f):
    """Convert a floating point number to a Decimal with no loss of information.
        See: http://docs.python.org/release/2.6.7/library/decimal.html#decimal-faq
    """
    n, d = f.as_integer_ratio()
    numerator, denominator = Decimal(n), Decimal(d)
    ctx = Context(prec=60)
    result = ctx.divide(numerator, denominator)
    while ctx.flags[Inexact]:
        ctx.flags[Inexact] = False
        ctx.prec *= 2
        result = ctx.divide(numerator, denominator)
    return result