Answers for "does setup py use requirements.txt"

python requirements.txt

pip freeze #view requirements to be created (best done in virtual env)
pip freeze > requirements.txt #create requirements.txt (best done in virtual env)
pip install -r requirements.txt #install requirements.txt (best done in virtual env)

command to install requirements.txt

$ pip install -r requirements.txt --no-index --find-links file:///tmp/packages