# 定义一个浮点数number=3.1415926# 使用round()函数限制到两位小数rounded_number=round(number,2)print(rounded_number)# 输出: 3.14 1. 2. 3. 4. 5. 6. 7. 自定义函数实现 如果你想要更多的控制或者想要实现更复杂的逻辑,可以编写自定义函数: deflimit_two_decimals(num):# 使用字符串格式化保留两位小数...
下面是一个简单的类图示例,用来表示一个名为FloatProcessor的类,该类封装了处理浮点数的方法: 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...
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.SeeFloatingPointArithmetic:IssuesandLimitationsformore information. 简单的说就...
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.SeeFloatingPointArithmetic:IssuesandLimitationsformore information. 简单的说就...
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>>> round(3.4)3...
>>>round(2.675,2)2.67 python2和python3的doc中都举了个相同的栗子,原文是这么说的: 代码语言:javascript 复制 Note The behaviorofround()forfloats can be surprising:forexample,round(2.675,2)gives2.67insteadofthe expected2.68.This is not a bug:it’s a resultofthe fact that most decimal fractions...
The behavior ofround()for floats can be surprising: for example,round(2.675,2)gives2.67instead of the expected2.68. This is not a bug: it’s a result of the fact thatmost decimal fractions can’t be represented exactly as a float. SeeFloating Point Arithmetic: Issues and Limitationsfor mor...
>>>round(2.675,2) 2.67 python2和python3的doc中都举了个相同的例子,原文是这么说的: Note Thebehavior 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...
round 可以准确舍入，但它涉及的移位计算也可能带来其他误差。Python 的 decimal 包可用于解决这一问题。
round(number[,ndigits])Return the floating point valuenumberrounded tondigitsdigits after the decimal point. Ifndigitsis omitted, it returns the nearest integer to its input. Delegates tonumber.__round__(ndigits).For the built-in types supportinground(), values are rounded to the closest mul...