Using pip with a Python virtual environment (venv)

A venv is a way of isolating the host environment from that of a python project. I only came across these because Pycharm decided to adopt them by default now when creating new projects.

To install additional modules using pip we must firstly enter the virtual environment - your project should look something like:

├── bin
│   ├── activate
│   ├── activate.csh
│   ├── activate.fish
│   ├── activate_this.py
│   ├── easy_install
│   ├── easy_install-3.6
│   ├── pip
│   ├── pip3
│   ├── pip3.6
│   ├── python -> python3.6
│   ├── python3 -> python3.6
│   ├── python3.6
│   ├── python-config
│   ├── watchmedo
│   └── wheel
├── include
│   └── python3.6m -> /usr/include/python3.6m
├── lib
│   └── python3.6
├── lib64 -> lib
└── pip-selfcheck.json

In order to enter the virtual environment cd to the project directory e.g.:

cd /path/to/your/project

and then issue the following:

source venv/bin/activate

we can then use pip as usual to install modules:

pip install watchdog