xpathast.py 文件源码

def _eval(self, xctx: XPathContext) -> float:
        dec = decimal.Decimal(self.expr._eval_float(xctx))
        try:
            return float(dec.to_integral_value(
                decimal.ROUND_HALF_UP if dec > 0 else decimal.ROUND_HALF_DOWN))
        except decimal.InvalidOperation:
            return float('nan')