如何对对象内部的数字进行舍入

let num = 123.456;

// 四舍五入到最接近的整数
let roundedNum = Math.round(num); // 123

// 向上取整
let ceilNum = Math.ceil(num); // 124

// 向下取整
let floorNum = Math.floor(num); // 123

// 银行家舍入（自定义函数）
function bankersRounding(num) {
    let rounded = Math.round(num * 100) / 100;
    return rounded;
}
let bankersNum = bankersRounding(num); // 123.46

num = 123.456

# 四舍五入到最接近的整数
rounded_num = round(num) # 123

# 向上取整
ceil_num = math.ceil(num) # 124

# 向下取整
floor_num = math.floor(num) # 123

# 银行家舍入（自定义函数）
def bankers_rounding(num):
    return round(num + 0.0005) if num >= 0 else round(num - 0.0005)

bankers_num = bankers_rounding(num) # 123.46

from decimal import Decimal, ROUND_HALF_UP

num = Decimal('123.456')
rounded_num = num.quantize(Decimal('1'), rounding=ROUND_HALF_UP) # 123