What is pip's equivalent of `npm install package --save-dev`?

Question

In nodejs, I can do npm install package --save-dev to save the installed package into the package.

How do I achieve the same thing in Python package manager

Answer 1

Update: apparently, pipenv is not officially endorsed by Python maintainers, and the previously-linked page is owned by a different organization. The tool has its pros and cons, but the below solution still achieves the result that the OP is seeking.

pipenv is a dependency management tool that wraps pip and, among other things, provides what you're asking:

https://pipenv.kennethreitz.org/en/latest/#example-pipenv-workflow

$ pipenv install

This will create a Pipfile if one doesn’t exist. If one does exist, it will automatically be edited with the new package your provided.

A Pipfile is a direct equivalent of package.json, while Pipfile.lock corresponds to package-lock.json.