具有修改后环境的Python子进程/Popen [英] Python subprocess/Popen with a modified environment

问题描述

我认为在环境稍有修改的情况下运行外部命令是很常见的情况.这就是我倾向于这样做的方式:

I believe that running an external command with a slightly modified environment is a very common case. That's how I tend to do it:

import subprocess, os
my_env = os.environ
my_env["PATH"] = "/usr/sbin:/sbin:" + my_env["PATH"]
subprocess.Popen(my_command, env=my_env)

我有一种直觉，觉得有更好的办法了.看起来还好吗?

I've got a gut feeling that there's a better way; does it look alright?

推荐答案

如果您不打算为当前进程修改os.environ，我认为os.environ.copy()更好:

I think os.environ.copy() is better if you don't intend to modify the os.environ for the current process:

import subprocess, os
my_env = os.environ.copy()
my_env["PATH"] = "/usr/sbin:/sbin:" + my_env["PATH"]
subprocess.Popen(my_command, env=my_env)

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