'/' 和 '//' 用于除法时有什么区别? [英] What is the difference between '/' and '//' when used for division?

问题描述

使用一个比另一个有好处吗?在 Python 2 中，它们似乎都返回相同的结果:

<预><代码>>>>6/32>>>6//32

解决方案

在 Python 3.x 中，5/2 将返回 2.5 和 5//2 将返回 2.前者是浮点除法，后者是整除法，有时也称为整数除法.>

在 Python 2.2 或更高版本的 2.x 行中，整数没有区别，除非您执行 from __future__ import Division，这会导致 Python 2.x 采用 3.x 行为.

无论以后导入如何，5.0//2 将返回 2.0 因为这是操作的楼层划分结果.

您可以在 https 上找到详细说明://docs.python.org/whatsnew/2.2.html#pep-238-changed-the-division-operator

Is there a benefit to using one over the other? In Python 2, they both seem to return the same results:

>>> 6/3
2
>>> 6//3
2

解决方案

In Python 3.x, 5 / 2 will return 2.5 and 5 // 2 will return 2. The former is floating point division, and the latter is floor division, sometimes also called integer division.

In Python 2.2 or later in the 2.x line, there is no difference for integers unless you perform a from __future__ import division, which causes Python 2.x to adopt the 3.x behavior.

Regardless of the future import, 5.0 // 2 will return 2.0 since that's the floor division result of the operation.

You can find a detailed description at https://docs.python.org/whatsnew/2.2.html#pep-238-changing-the-division-operator

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