[Python] VSCode terminal cannot import environment variables

I am using Ubuntu + VSCode + Django + venv for developing and I have a trouble while trying to launch django project. I've done this command one by one in terminal:

source .venv/bin/activate
cd my_project
python manage.py makemigrations


but last one returns this:

ALLOWED_HOSTS = os.getenv('ALLOWED_HOSTS').split(' ')
AttributeError: 'NoneType' object has no attribute 'split'


I think getenv returns None, but I have ALLOWED_HOSTS in my .env file. I don't wanna use python_dotenv. What can I do to solve this problem?

I've tried to install DotENV extension for VSCode, change user settings in vscode, but nothing worked

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