In node.js, one can do npm update --production during deployment and all the relevant node.js modules will be installed as long as the right package.json is in place.
Is there a python equivalent command line for easy deployment? Can pip do the same thing as npm?
yes there is an command for doing that , once you want to deploy you can generate the package file using the following command:
pip freeze > requirements.txt
and whenever you want to install the packages from same file use:
pip install -r requirements.txt
you can find more info about freeze here