Using Python virtual environments

Create virtual environment named env inside current directory:
python -m venv env_pn

Create virtual environment named env inside current directory using a specific version of Python:
python -3.13 -m venv env_pn

Activate virtual environment (NB: capitalisation matters, as does the fact they’re backslashes rather than forward slashes):
env\Scripts\activate

Deactivate virtual environment:
deactivate

Create requirements.txt:
pip freeze > requirements.txt

Load requirements.txt (NB: activate virtual environment first):
pip install -r requirements.txt