C++ 和 Python 中的交换有什么区别? [英] What are the differences between swap in C++ and Python?

问题描述

关于swap，在C++中，我们可以通过std::swap(x, y);来交换两个.x 和 y 作为 reference 传递到 swap.

About swap, in C++, we can swap two by std::swap(x, y);. x and y are passed into swap as reference.

但是在 Python 中，我们是否也可以编写一个 swap 函数，它可以像在 C++ 中一样进行交换?我实现的 Python 版本的 swap 有点愚蠢:

But in Python, can we also write a swap function which can do the swap the same way as in C++? The Python version of swap I implemented is kinda stupid:

def swap_in_python(x, y):
    return y, x

#so when swapping a and b, I usually do it like this
a, b = swap_in_python(a, b)

这确实很麻烦，但是我们不能像在C++中那样传递引用或指针，对吧?

This is really cumbersome, but we can't pass reference or pointer as what we can do in C++, right?

有没有其他不使用赋值的方法(不使用=)?

Is there any other way not employing assignment(not using =)?

推荐答案

实际上，在 Python 中，它要优雅得多:

Actually, in Python, it's much more elegant:

(a,b) = (b,a)

您根本不必调用函数.而且，是的，根据评论，此处不需要括号.我仍然更喜欢它们，因为我相信它们使意图更清晰.

You don't have to call a function at all. And, yes, as per the comments, the parentheses are unnecessary here. I still prefer them since I believe they make the intent clearer.

以下

有没有其他不使用赋值的方法(不使用=)?

Is there any other way not employing assignment (not using =)?

可能，虽然我不知道，我无法想象它会比上面显示的基本方式更简单或更易读.如果您正在寻找一种更 更复杂的方式来做可以简单完成的事情，我是否可以建议您处于错误的心态?:-)

Possibly, though I don't know of one, and I can't imagine it would be simpler or more readable than the basic way shown above. If you're looking for a more complicated way of doing things that can be done simply, might I suggest that you're in the wrong mindset? :-)

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