如何在不知道哪个更大的情况下找到两个值之间的差异?

问题描述

我想知道 Python 中是否有一个函数可以确定两个有理数之间的距离，但我没有告诉它哪个数字更大.例如

I was wondering if there was a function built into Python that can determine the distance between two rational numbers but without me telling it which number is larger. e.g.

>>>distance(6,3)
3
>>>distance(3,6)
3

显然我可以写一个简单的定义来计算哪个更大，然后做一个简单的减法:

Obviously I could write a simple definition to calculate which is larger and then just do a simple subtraction:

def distance(x, y):
    if x >= y:
        result = x - y
    else:
        result = y - x
    return result

但我宁愿不必调用这样的自定义函数.根据我有限的经验，我经常发现 Python 有一个内置函数或模块，可以完全按照您的意愿执行操作，并且比您的代码执行速度更快.希望有人能告诉我有一个内置函数可以做到这一点.

but I'd rather not have to call a custom function like this. From my limited experience I've often found Python has a built in function or a module that does exactly what you want and quicker than your code does it. Hopefully someone can tell me there is a built in function that can do this.

推荐答案

abs(x-y) 将完全满足您的需求:

abs(x-y) will do exactly what you're looking for:

In [1]: abs(1-2)
Out[1]: 1

In [2]: abs(2-1)
Out[2]: 1

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