Python 命令行 -x 选项 [英] Python command line -x option

问题描述

我最近看到 python 将 -x 作为命令行选项，它在此处的文档中解释了这一点

I saw recently that python takes -x as a command line options which does what it explains in the docs here

python -x

Skip the first line of the source, allowing use of non-Unix forms of #!cmd. This is intended for a DOS specific hack only.

但是，请原谅我 :) 我真的不明白为什么有人会使用 #!cmd 的非 Unix 形式，即使使用了(对于 DOS)为什么要跳过它?

But, pardon me :) I don't really understand why someone would use a non-Unix form of #!cmd and even if it one does(for DOS) why skip it ?

推荐答案

使用以下第一行启动 Windows 批处理脚本 (.bat/.cmd):

Start a Windows batch script (.bat/.cmd) with this first line:

@echo off & python -x "%~f0" %* & goto :eof

当您运行它时，cmd.exe 将静默运行 python -x 并带有脚本的完整文件路径和其余的命令行参数，然后忽略文件的其余部分.python 将读取文件，跳过第一行(不会解析为 Python 代码)，并将其余部分视为普通 Python 脚本.

When you run it, cmd.exe will silently run python -x with the full file path to the script and the rest of the command-line arguments, then ignore the rest of the file. python will read the file, skipping the first line (which wouldn't parse as Python code), and treating the rest like a normal Python script.

这在类 UNIX 平台上不是必需的，因为您会放置

This isn't necessary on UNIX-like platforms because you'd put

#!/usr/bin/env python

在脚本的顶部获得类似的行为，这看起来像是对 Python 的注释，因此它继续执行文件的其余部分就好了.

at the top of a script to get similar behavior, which looks like a comment to Python, so it continues executing through the rest of the file just fine.

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