Creating a virtual environment(name of virtual environment, 3rd argument, is "venv"):

1. (Into cmd): python -m venv venv
2. (Into cmd): venv\Scripts\activate.bat | (Into Bash): cd venv/ , cd Scripts/, . activate

Creating a virtual environment with system packages(packages already on machine)(name of virtual environment, 3rd argument, is "venv"):

1. (Into cmd): python -m venv venv --system-site-packages
2. (Into cmd): venv\Scripts\activate.bat | (Into Bash): cd venv/ , cd Scripts/, . activate

Exit venv(cmd or bash):

1. deactivate

See packages(including system packages):

1. pip list

See packages(local to virtual environment):

1. pip list --local

Get requirements.txt:

1. pip freeze

Install Requirements from requirements.txt:

1. pip install -r requirements.txt

Remove virtual environment(name of virtual environment, 1st argument, is "venv"):

1. (Into cmd): rmdir venv /s

Demo: https://youtu.be/3r8EhDwPFX0