python的加/减运算符± [英] plus/minus operator for python ±

问题描述

我正在寻找一种在 python 2 或 3 中执行加/减运算的方法.我不知道命令或运算符，也找不到执行此操作的命令或运算符.

I am looking for a way to do a plus/minus operation in python 2 or 3. I do not know the command or operator, and I cannot find a command or operator to do this.

我错过了什么吗?

推荐答案

另一种可能性:uncertainties 是一个模块用于进行容错计算，即

Another possibility: uncertainties is a module for doing calculations with error tolerances, ie

(2.1 +/- 0.05) + (0.6 +/- 0.05)    # => (2.7 +/- 0.1)

可以写成

from uncertainties import ufloat

ufloat(2.1, 0.05) + ufloat(0.6, 0.05)

我得到了一些奇怪的结果，经过更多的尝试后，我想出了原因:指定的错误不是容差(工程蓝图中的硬性附加限制)，而是一个标准差值 - 这就是为什么上述计算结果

I was getting some odd results, and after a bit more playing with this I figured out why: the specified error is not a tolerance (hard additive limits as in engineering blueprints) but a standard-deviation value - which is why the above calculation results in

ufloat(2.7, 0.07071)    # not 0.1 as I expected!

这篇关于python的加/减运算符±的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！