Now, a problem I had is that if I tried to use os.system to run a batch file that sets your environment variables (using the SET command in a **.bat* file) it would not really set them for your python environment (but for the child process that is created with the os.system function). To actually get the variables set in the python environment ...

Dec 3, 2011 · Unix only: Execute env to set the environment variable. More cumbersome if you have many variables to modify and not portabe, but like #2 you retain full control over python and children environments.

So using os.system will set it only for the shell that is running to execute the command you provided. When that command finishes, the shell goes away, and so does the environment variable. Setting it using os.putenv or os.environ has a similar effect; the environment variables are set for the Python process and any children of it.

Feb 5, 2011 · I haven’t set it (PYTHONPATH) before; what I am doing just go with command prompt and type CMD anywhere (since python.exe is in my shell PATH). If I try to access Window ENVIRONMENT variable, it gives mapped value but the problem with Python ENVIRONMENT variable like; PYTHONPATH and PYTHONHOME. –

Mar 3, 2023 · @Royi Not just on Windows, but in a Jupyter Notebook on Linux, this did not change the environment variable either, at least not well enough: it does change something as it does somehow claim the memory, but it does not seem to fully pass it to the compiler, it seems to be a rights issue of the user that you are in. %set_env and os.environ[] will both fail if code must run with settings from ...

Dec 2, 2021 · But you can not set values for env in the system itself or other processes (that are not children of the current process). For example if I set a env variable called HOST_URL it wont be actually accessible in the system environment. I found three ways to actually set the variables by: Running a bash script to set the env variable values

The requestor asked how to set an environment variable via Python, not how to set the environment variable via Python for the next login, or after source ~/.bashrc is run. – Wayne Workman Commented Jun 7, 2022 at 4:11

I organized my python environment variable like this under Win7 64-bit using cmd. I set the variable PYTHONPATH via environment variable menue of windows and added %PYTHONPATH% to the PATH variable:...;%PYTHONPATH% The cmd shell expands the variable correctly to this: C:\>echo %PYTHONPATH% C:\python27;c:\python27\lib;C:\python27\scripts

Oct 22, 2014 · One quick solution to those who are still struggling with environment variable setup issue. Just Uninstall the existing python version and reinstall it make sure to enable checkbox as "Add Python 3.10 to PATH to the environment variable.

Mar 4, 2012 · sets or updates an environment variable on activation. restores the previous value of the environment variable on deactivation. SOLUTION: Create the MY_ENV environment. python -m venv MY_ENV Open the activate script in any text editor (e.g vim). vim MY_ENV/bin/activate Update the body of the deactivate function.