Unset environment variable in Jupyter Notebook

How do I unset an environmental variable in Jupyter Notebook? I set the variables using a .env file that is loaded by:

from dotenv import load_dotenv
load_dotenv('./.env')

After changing the .env file and rerunning the import/load does the variable stays the same (the old version). I tried setting the environment variable to None using the magic command but it's literally now None instead of blank. I didnt see any unset command at https://ipython.readthedocs.io/en/stable/interactive/magics.html

Any way to accomplish this?

Copyright Notice：Content Author:「DChaps」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/73285390/unset-environment-variable-in-jupyter-notebook

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