Follow the instructions:

Get requirements.txt from rawfile;

curl https://gist.githubusercontent.com/enesusta/530e923c750502e406f6010fa7f4a408/raw/b10f70bf2bf1c24757c74d13cdf917fa35ee3e0b/requirements.txt --output requirements.txt

pip install -r requirements.txt

or

Create requirements.txt

And paste this;

urllib3
bs4
requests

Then;

pip install -r requirements.txt