如何使用Python访问系统环境变量

Question

I am aware that you can use os.environ['key'] to access an environment variable, but it appears that this function is localized to environment variables for the signed in user. I need to access the system environment variables. Is this possible?

Answer 1

You cannot do this using os.environ in python. You can, however, use os.system to run a commands such as:

sudo -Hiu $user env | grep $var

to access a variable from another user. This is a bit hacky, but it works. And your options are limited here.

Also -- why do you want to? You should have a process for setting the environment variables before this script is run at all, ideally.