这是从哪里来的:-*- 编码:utf-8 -*- [英] Where does this come from: -*- coding: utf-8 -*-

问题描述

Python 将以下内容识别为定义文件编码的指令:

Python recognizes the following as instruction which defines file's encoding:

# -*- coding: utf-8 -*-

我之前肯定看到过这种指令(-*- var: value -*-).它从何而来?什么是完整规格，例如值可以包括空格、特殊符号、换行符，甚至 -*- 本身吗?

I definitely saw this kind of instructions before (-*- var: value -*-). Where does it come from? What is the full specification, e.g. can the value include spaces, special symbols, newlines, even -*- itself?

我的程序将编写纯文本文件，我想使用这种格式在其中包含一些元数据.

My program will be writing plain text files and I'd like to include some metadata in them using this format.

推荐答案

这种指定 Python 文件编码的方式来自 PEP 0263 - 定义 Python 源代码编码.

This way of specifying the encoding of a Python file comes from PEP 0263 - Defining Python Source Code Encodings.

它也被 GNU Emacs 识别(参见 Python 语言参考，2.1.4 编码声明)，虽然我不知道它是否是第一个使用该语法的程序.

It is also recognized by GNU Emacs (see Python Language Reference, 2.1.4 Encoding declarations), though I don't know if it was the first program to use that syntax.

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