_compat.py 文件源码

def round_py2_compat(what):
    """
    Python 2 and Python 3 use different rounding strategies in round(). This
    function ensures that results are python2/3 compatible and backward
    compatible with previous py2 releases
    :param what: float
    :return: rounded long
    """
    d = Context(
        prec=len(str(long(what))),  # round to integer with max precision
        rounding=decimal.ROUND_HALF_UP
    ).create_decimal(str(what))  # str(): python 2.6 compat
    return long(d)