Python 中的“@="符号是什么? [英] What is the '@=' symbol for in Python?

问题描述

我知道 @ 是用于装饰器的，但是 @= 在 Python 中是什么?是否只是为一些未来的想法保留?

I know @ is for decorators, but what is @= for in Python? Is it just reservation for some future idea?

这只是我在阅读 tokenizer.py 时的众多问题之一.

This is just one of my many questions while reading tokenizer.py.

推荐答案

来自 文档:

@ (at) 运算符旨在用于矩阵乘法.没有内置的 Python 类型实现此运算符.

The @ (at) operator is intended to be used for matrix multiplication. No builtin Python types implement this operator.

@ 运算符是在 Python 3.5 中引入的.@= 是矩阵乘法，然后是赋值，正如您所期望的.它们映射到 __matmul__、__rmatmul__ 或 __imatmul__ 类似于 + 和 +=映射到 __add__、__radd__ 或 __iadd__.

The @ operator was introduced in Python 3.5. @= is matrix multiplication followed by assignment, as you would expect. They map to __matmul__, __rmatmul__ or __imatmul__ similar to how + and += map to __add__, __radd__ or __iadd__.

PEP 465.

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