I need to make an export like this in Python :
# export MY_DATA="my_export"
I've tried to do :
# -*- python-mode -*- # -*- coding: utf-8 -*- import os os.system('export MY_DATA="my_export"')
But when I list export, "MY_DATA" not appear :
How I can do an export with Python without saving "my_export" into a file ?
You actually want to do
import os os.environ["MY_DATA"] = "my_export"
export is a command that you give directly to the shell (e.g.
bash), to tell it to add or modify one of its environment variables. You can't change your shell's environment from a child process (such as Python), it's just not possible.
Here's what's happening with you try
/bin/bash process, command `python yourscript.py` forks python subprocess |_ /usr/bin/python process, command `os.system()` forks /bin/sh subprocess |_ /bin/sh process, command `export ...` changes local environment
When the bottom-most
/bin/sh subprocess finishes running your
export ... command, then it's discarded, along with the environment that you have just changed.