from decimal import Decimal, ROUND_HALF_UP value = Decimal("3.14159") rounded_value = value.quantize(Decimal("0.01"), rounding=ROUND_HALF_UP) print(rounded_value) # 输出:3.14 使用decimal模块的优点是可以更好地控制四舍五入的规则,
首先需要导入Decimal模块: from decimal import Decimal, ROUND_HALF_UP 创建Decimal对象 可以通过将字符串转换为Decimal对象来创建Decimal对象: number = Decimal("3.14159") 保留两位小数 可以使用quantize()方法来保留指定的小数位数: rounded_number = number.quantize(Decimal("0.00"), rounding=ROUND_HALF_UP) pri...
3. 使用decimal模块 对于需要高精度小数运算的场景,可以使用decimal模块: python from decimal import Decimal, ROUND_HALF_UP number = Decimal('3.14159') rounded_number = number.quantize(Decimal('0.01'), rounding=ROUND_HALF_UP) print(rounded_number) # 输出: 3.14 decimal模块在处理金融和需要精确小数控...
Round to 2 decimal places using the round() function The round() function is Python’s built-in function for rounding float point numbers to the specified number of decimal places. You can specify the number of decimal places to round by providing a value in the second argument. The example...
Python Django round to two decimal places In this section, we’ll learn basic knowledge of rounding off numbers up to two decimal places. The floating-point numbers are divided into two parts integer part and the fractional part. And they are separated with the decimal point. ...
在上述代码中,首先将输入的数字转换为Decimal类型,然后使用quantize()方法将小数位数设为2,并通过参数rounding=ROUND_HALF_UP来指定四舍五入方式。最后返回强制保留两位小数的结果。 对于应用场景,如果需要对金融数据进行精确计算,保留两位小数是常见需求。例如在财务系统中,进行金额的加减乘除运算时,需要保持精确度,因此...
>>>TWOPLACES = Decimal(10) ** -2 # same as Decimal('0.01') >>># Round to two places >>>Decimal('3.214').quantize(TWOPLACES) Decimal('3.21') >>># Validate that a number does not exceed two places >>>Decimal('3.21').quantize(TWOPLACES, context=Context(traps=[Inexact])) ...
rounding 设置量化到配置精度时使用的舍入模式。 有效值是 decimal 模块舍入模式。 默认为 None。 序列化goods_price 字段 代码语言:javascript 代码运行次数:0 运行 AI代码解释 # 作者-上海悠悠QQ交流群:717225969# blog地址 https://www.cnblogs.com/yoyoketang/classGoodsSerializer(serializers.ModelSerializer):"...
Financial calculations often require rounding to 2 decimal places for currency. The round function is perfect for this when exact precision isn't critical. For banking applications where exact decimal representation is crucial, the decimal module with its context-based rounding is recommended. ...
fromdecimalimportDecimal,ROUND_HALF_UPdefformat_decimal(value):try:# 转换为Decimaldecimal_value=Decimal(value)# 四舍五入到2位小数formatted_value=decimal_value.quantize(Decimal('0.00'),rounding=ROUND_HALF_UP)returnstr(formatted_value)exceptExceptionase:return"输入无效,请输入有效的数字。"# 测试输出pri...