FloatProcessor- num: float+round_to_two_decimals() : float+format_to_two_decimals() : str+floor_to_two_decimals() : float 旅行图 让我们用一个旅行图的示例来说明使用上述三种方法处理浮点数的过程: 使用round函数 FloatProcessor->FloatProcessor FloatProcessor->FloatProcessor FloatProcessor-->FloatP...
round()函数可以接受两个参数,第一个参数是要进行截断的浮点数,第二个参数是要保留的小数位数。为了截断浮点数后面的小数,可以将小数部分与整数部分相加后取整数部分。具体实现如下: 代码语言:txt 复制 import math def truncate_float(num, decimal_places): integer_part = int(num) # 获取整数部分 decimal...
Here, we will create a list of floats that will be converted to integers in this tutorial. In your preferred Python IDE, run the line of code below.float_list = [1.2, 3.4, 5.6]As seen, the list of floats was created by concatenating three decimals in a square bracket and named as ...
方法/步骤 1 round简介round(number[, ndigits])对浮点数进行近似取值，保留几位小数。第一个参数是一个浮点数，第二个参数是保留的小数位数，可选，如果不写的话默认保留到整数 2 round用法举例>>> round(1.34)1>>> round(1.34,1)1.3>>> round(-1.34)-1>>> round(-1.34,1)-1.3>>> rou...
3. 4. 5. 6. 强制四舍五入 使用decimal from decimal import Decimal, ROUND_HALF_UP def round(number, ndigits=None): """强制四舍五入""" exp = Decimal('1.{}'.format(ndigits * '0')) if ndigits else Decimal('1') return type(number)(Decimal(number).quantize(exp, ROUND_HALF_UP)...
python2和python3的doc中都举了个相同的例子,原文是这么说的: NoteThebehavior of round()forfloats can be surprising:forexample,round(2.675,2)gives2.67instead of the expected2.68.Thisisnota bug:it’s a result of the fact that mostdecimalfractions can’t be represented exactlyasafloat.SeeFloatingPoi...
3、decimal模块 decimal是Python核心库用于实现高精度小数运算模块。对比原生的float类型,Decimal类型能更好地保证计算精度,特别是货币计算或涉及其他高精度计算的场景。 rounding参数取值ROUND_HALF_UP, from decimal import Decimal, ROUND_HALF_UP In [127]: Decimal("3.124").quantize(Decimal("0.00"), rounding=...
Round Float to Decimals Write a Python program to round a floating-point number to a specified number of decimal places. Sample Solution: Round to specified Decimals using %f Function: Python Code: # Define the order amount as a floating-point number.order_amt=212.374# Print the total order...
(对于精确的数值,ROUND函数使用四舍五入) For approximate-value numbers, the result depends on...(对于近似值,则依赖于底层的C函数库,在很多系统中ROUND函数会使用“取最近的偶数”的规则) 通过这两条规则,我们可以看出,由于我们在使用两个字段相乘的时候,最终的结果是按照float类型处理的,而在计算机...
2.68. This is not a bug: it's a result of the fact that most decimal fractions can't be represented exactly as afloat. See Floating Point Arithmetic: Issues and Limitations for more information. 简单的说就是,round(2.675, 2) 的结果,不论我们从python2还是3来看,结果都应该是2.68的,结果它...