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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 :
# export How I can do an export with Python without saving "my_export" into a file ?
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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 when you try os. system('export MY_DATA="my_export"') …
In this guide, we will look at the export command in Linux. Export is a built-in command of the Bash shell. It is used to mark variables and functions to be passed to child processes. Basically, a variable will be included in child process environments without affecting other environments.
The export command is fairly simple to use as it has straightforward syntax with only three available command options. In general, the export command marks an environment variable to be exported with any newly forked child processes and thus it allows a child process to inherit all marked variables.
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 when you try os.system('export MY_DATA="my_export"')...
/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 its 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.
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