Be sure to use a virtual environment:
$ python3 -m venv venv
Here, venv is just an example, the virtual environment can be given any name.
To activate the virtual environment, run the following command:
$ source venv/bin/activate
Upon activation, run pip list. Only pip and setuptools should be installed in the virtual environment.
To install requirements, run:
$ pip install -r requirements.txt
Create a .env file:
$ touch .env
Add PERPLEXITY_API_KEY to the .env.