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,并且能够处理高精度计算,避免浮点数计算中的精度问题。 四、使用nump...
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...
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...
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...
NumPy ufuncs - Rounding Decimals, There are primarily five ways of rounding off decimals in NumPy: Truncate elements of following array: Round off 3.1666 to 2 decimal places:. Why will numpy.round will not round my array? Solution:
>>>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])) ...
4.4 四舍五入到负数的小数位 (Rounding to Negative Decimal Places) print(round(123456, -2)) # 输出: 123500print(round(123456, -3)) # 输出: 123000 在这个例子中,负数的小数位数表示要进行“向左”的四舍五入,pz.fuxingpeizi.cn,。 5. 常见应用场景 (Common Use Cases) 5.1 财务计算 (Financial ...
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. ...
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...
ROUND_UP rounding mode from the decimal module from decimal import Decimal, ROUND_UP # Create a Decimal object from a string representation of a floating-point number d = Decimal("-3.14159") # Round the Decimal object to nearest integer using the ROUND_UP rounding mode rounded_d_int = d....