A requirements file contains a list of packages to install. Usually, these are dependencies for the current package. It can be created manually or using the pip freeze command. The index URL can be specified in the first line of the file, For example:
requirements.txt
--index-url http://localhost:8081/artifactory/api/pypi/pypi-local/simple PyYAML==3.11 argparse==1.2.1 frog-bar==0.2 frog-fu==0.2a nltk==2.0.4 wsgiref==0.1.2