[feature-request] Install requirements when running pip install

[ghost]

Can we get a feature, so that when we run pip install, it installs the requirements of the requirements.txt, instead of typing pip install -r requirements.txt (like in NPM for Node.JS)?

[xavfernandez]

Strongly related to #2488

[xavfernandez]

I suggest to keep the discussion in one single place. The difference between the two issues seems to be the possible creation of a virtualenv in the process.
Closing as duplicate.

[ghost]

Okay, indeed the only difference is the virtualenv