Strings, lists, and tuples are objects

sudo pip install requests

pip install -r requirements.txt

Instead of pip install
python3 -m pip install

pip download -r requirements.txt
pip install --no-index --find-links /path/to/download/dir/ -r requirements.txt

pip download tensorflow
pip install 'tensorflow-xyz.whl' --no-index --find-links '.'

pip download --index-url=https://www.piwheels.org/simple --platform linux_armv7l --no-deps numpy

python3 -m pip install --user pipx
python3 -m pipx ensurepath

brew install pipx
pipx ensurepath