>>> round(1.456, 2) # 1.46 >>> round(16743, -3) # 17000 >>> format(1.2345, '0.3f') # 1.235 二、精确的小数计算 浮点数无法精确表达出所有的十进制小数位。 0.4的二进制表示是无限循环,所以如果要精确表示0.4,计算机需要无限个二进制位才能做到。 然而计算机的内存、CPU寄存器等等硬件单元都是有限...
1.function returnFloat(value){},参数是要被转换的数字。 2.var value=Math.round(parseFloat(value)*100)/100,这个应该是函数的核心之处,parseFloat(value)将参数转换为浮点数,因为参数有可能是字符串,乘以100是因为要保留两位小数,先将小数点向右移动两个位数,然后再利用Math.round()方法实行四舍五入计算,最后...
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...
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 amount with 6 decimal places.print('\nThe total order amount comes to %f'%order_amt)# Print the total order amount with 2 decimal pla...
Round to Two Decimals using format() Function We can usestr.format()function to display float value with two decimal places. It keeps the actual value intact and is simple to implement. Syntax {:0.2f}, .format(number) Example 1
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...
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...
as number.NoteThe behavior of round() for floats can be surprising: for example, round(2.675, 2) gives 2.67 instead of the expected 2.68. This is not a bug: it’s a result of the fact that most decimal fractions can’t be represented exactly as a float....
python里如何保存float类型的小数的位数 :5.03floatfrom decimalimportDecimal'0.00'))Out[10]:('5.03')quantize11]:Decimal() 这里有三种方法, round(a,2) ‘%.2f’ % a Decimal(‘5.000’).quantize(Decimal(‘0.00’)) 当需要输出的结果要求有两位小数的时候,字符串形式的:’%.2f’ % a 方式最好,...
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...