res_1=round(1.41401,3)res_2=round(-1.41401,3)res_3=round(0.5)print(res_1)# 1.414print(res_2)# -1.414print(res_3)# 0 可以看出上述分别输出为1.414、-1.414和0。实际上Python的round()函数可以接受两个参数round(value, ndigits),第一个参数为实际操作数,第二个参数为实际保留几位,如果第二个参...
在Python中,可以使用内置的round()函数来对小数点后的数字进行舍入。round()函数的语法如下: round(number, ndigits) 其中,number是要进行舍入的数字,n...
(values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward the even choice) 同时,float类型采用双精度二进制存储(参照IEEE754标准),round函数使用的是二进制存储值,在舍入时会对结果产生影响,而round本身没有使用四舍五入...
While pathological cases do exist, for most casual use of floating-point arithmetic you’ll see the result you expect in the end if you simply round the display of your final results to the number of decimal digits you expect.str()usually suffices, and for finer control see thestr.format(...
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_HALF_UP)...
1.round()内置方法 这个是使用最多的,刚看了round()的使用解释,也不是很容易懂。round()不是简单的四舍五入的处理方式。 For the built-in types supporting round(), values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is do...
1.round()内置方法 这个是使用最多的，刚看了round()的使用解释，也不是很容易懂。round()不是简单的四舍五入的处理方式。Forthebuilt-intypessupportinground(),valuesareroundedtothe closestmultipleof10tothepowerminusndigits;iftwomultiplesareequally close,roundingisdonetowardtheevenchoice(so,for...
4. 运行上述代码,我们会得到精确的2.68作为结果。 5. 关系图 下面是Python浮点数限制的关系图: erDiagram float --|{ IEEE 754 double-precision format } IEEE 754 double-precision format --|{ 15 to 17 significant digits } IEEE 754 double-precision format --|{ Range from 10^-308 to 10^308 }...
1.round()内置方法 这个是使用最多的,刚看了round()的使用解释,也不是很容易懂。round()不是简单的四舍五入的处理方式。 For the built-in types supporting round(), values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is do...
Python has a built-in round() function that takes two numeric arguments, n and ndigits, and returns the number n rounded to ndigits. The ndigits argument defaults to zero, so leaving it out results in a number rounded to an integer. As you’ll see, round() may not work quite as ...