如何使用 python 设置环境变量？

Question

I wish to read an .env file with python and expose the environment variables so they can be accessed by other scripts in the same environment. I have this script:

from dotenv import load_dotenv
import os

load_dotenv("common.env")
print(os.environ["CONFIG_FOLDER_NAME"])

When I run this script it prints the correct value.

However when I try to read the variables from a different file they don't seem to exist. Even if I do echo $CONFIG_FOLDER_NAME it return empty.

Answer 1

Ok so based on the comment above, to help future users who might not be aware of this, you cannot set environment variables from Python .

You can make python aware of some variables but they want be actually accessible in the environment.

I found three ways to actually set the variables by:

1. Running a bash script to set the env variable values
2. Use VSCode launch.json for setting the variables either with env or envFile
3. Define them through Docker file or docker-compose.yml if you are containerizing your app

Note: If there are other options to address this please comment and I ll add them. I want this to be a helpfull post for new developers like myself. Shaming and non-helpful comments never helped anyone or improved anything. This is, or should be, a learning and knowledge exchange platform and it should be open to all programming questions