Python venv

Create

$ python3 -m venv <myenv>

For example, you can create a virtual environment directory named venv:

$ python3 -m venv venv

Activate your virtual environment:

$ source <myenv>/bin/activate

Verify your python and pip binaries:

$ which python
path/to/venv/bin/python
$ which pip
path/to/venv/bin/pip

Install from requirements.txt:

$ pip install -r requirements.txt

Install package black:

$ pip install black

Save dependencies to requirements.txt:

$ pip freeze > requirements.txt

Deactivate your virtual environment:

$ deactivate

Append your virtual environment directory to .gitignore:

$ echo <myenv> >> .gitignore